Topiramate (topiramate 100 mg) Dailymed

Generic: topiramate is used for the treatment of Bipolar Disorder Epilepsies, Partial Epilepsy, Tonic-Clonic Migraine Disorders Pain Spasms, Infantile Lennox Gastaut Syndrome

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Recent Major Changes

Warnings and Precautions (5.1, 5.4, 5.10, 5.11, 5.14)

10/2022

1 Indications And Usage

Topiramate extended-release capsules are indicated for:

Epilepsy: initial monotherapy for the treatment of partial-onset or primary generalized tonic-clonic seizures in patients 6 years of age and older (1.1); adjunctive therapy for the treatment of partial-onset, primary generalized tonic-clonic seizures, or seizures associated with Lennox-Gastaut syndrome (LGS) in patients 6 years of age and older (1.2)

Preventive treatment of migraine in patients 12 years of age and older (1.3)

1.1 Monotherapy Epilepsy
Topiramate extended-release capsules are indicated as initial monotherapy for the treatment of partial-onset or primary generalized tonic-clonic seizures in patients 6 years of age and older [see Clinical Studies (14.2)].

1.2 Adjunctive Therapy Epilepsy
Topiramate extended-release capsules are indicated as adjunctive therapy for the treatment of partial-onset seizures, primary generalized tonic-clonic seizures, and seizures associated with Lennox-Gastaut syndrome in patients 6 years of age and older [see Clinical Studies (14.3)].

1.3 Migraine
Topiramate extended-release capsules are indicated for the preventive treatment of in patients 12 years of age and older [see Clinical Studies (14.4)].

2 Dosage And Administration

Topiramate extended-release capsules^{initial dose, titration, and recommended maintenance dose varies by indication and age group. See Full Prescribing Information for recommended dosage, and dosing considerations in patients with renal impairment, geriatric patients, and patients undergoing hemodialysis (2.1, 2.2, 2.3, 2.4, 2.5, 2.6)}

Swallow capsule whole and intact. Do not sprinkle on food, chew, or crush (2.7)

2.1 Dosing in Monotherapy Epilepsy
Adults and Pediatric Patients 10 Years of Age and Older with Partial Onset or Primary Generalized Tonic-Clonic Seizures

The recommended dose for topiramate extended-release capsules monotherapy in adults and in pediatric patients 10 years of age and older is 400 mg orally once daily. Titrate topiramate extended-release capsules according to the following schedule:

Week 1 50 mg once daily

Week 2 100 mg once daily

Week 3 150 mg once daily

Week 4 200 mg once daily

Week 5 300 mg once daily

Week 6 400 mg once daily

Pediatric Patients Ages 6 to 9 Years of Age

Dosing in patients 6 to 9 years of age is based on weight. During the titration period, the initial dose of topiramate extended-release capsules is 25 mg/day nightly for the first week. Based upon tolerability, the dosage can be increased to 50 mg/day in the second week. Dosage can be increased by 25 mg/day to 50 mg/day each subsequent week as tolerated. Titration to the minimum maintenance dose should be attempted over 5 weeks to 7 weeks of the total titration period. Based upon tolerability and clinical response, additional titration to a higher dose (up to the maximum maintenance dose) can be attempted at 25 mg/day to 50 mg/day weekly increments. The total daily dose should not exceed the maximum maintenance dose for each range of body weight (see Table 1).

Table 1 Monotherapy Target Total Daily Maintenance Dosing for Patients 6 to 9 Years of Age

Weight (kg) Total Daily Dose (mg/day) Minimum Maintenance Dose Total Daily Dose (mg/day) Maximum Maintenance Dose

Up to 11 150 250

12 to 22 200 300

23 to 31 200 350

32 to 38 250 350

Greater than 38 250 400

2.2 Dosing in Adjunctive Therapy Epilepsy
Adults (17 Years of Age and Older)

The recommended total daily dose of topiramate extended-release capsules as adjunctive therapy in adults with partial-onset seizures or Lennox-Gastaut Syndrome is 200 mg to 400 mg orally once daily and with primary generalized tonic-clonic seizures is 400 mg orally once daily.

Initiate therapy at 25 mg to 50 mg once daily followed by titration to an effective dose in increments of 25 mg to 50 mg every week. Titrating in increments of 25 mg/day every week may delay the time to reach an effective dose. Doses above 400 mg/day have not been shown to improve responses in adults with partial-onset seizures.

Pediatric Patients 6 to 16 Years of Age

The recommended total daily dose of topiramate extended-release capsules as adjunctive therapy for patients 6 to 16 years of age with partial-onset seizures, primary generalized tonic-clonic seizures, or seizures associated with Lennox-Gastaut syndrome is approximately 5 mg/kg to 9 mg/kg orally once daily. Begin titration at 25 mg once daily (or less, based on a range of 1 mg/kg/day to 3 mg/kg/day) given nightly for the first week. Subsequently, increase the dosage at 1- or 2-week intervals by increments of 1 mg/kg/day to 3 mg/kg/day to achieve optimal clinical response. Dose titration should be guided by clinical outcome.

The total daily dose should not exceed 400 mg/day.

2.3 Dosing
The recommended total daily dose of topiramate extended-release capsules as treatment for the preventive treatment of migraine in patients 12 years of age and older is 100 mg once daily. Titrate topiramate extended-release capsules for the preventive treatment of migraine according to the following schedule:

Week 1: 25 mg once daily

Week 2: 50 mg once daily

Week 3: 75 mg once daily

Week 4: 100 mg once daily

Dose and titration rate should be guided by clinical outcome. If required, longer intervals between dose adjustments can be used.

2.4 Administration With Alcohol
Alcohol use should be completely avoided within 6 hours prior to and 6 hours after topiramate extended-release capsules administration [see Warnings and Precautions (5.5)].

2.5 Dose Modifications in Patients With Renal Impairment
In patients with renal impairment (creatinine clearance less than 70 mL/min/1.73 m²), one-half of the usual adult dose is topiramate extended release capsules are recommended [see Use in Specific Populations (8.5, 8.6), Clinical Pharmacology (12.3)].

2.6 Dosage Modifications in Patients Undergoing Hemodialysis
To avoid rapid drops in topiramate plasma concentration during hemodialysis, a supplemental dose of topiramate extended-release capsules may be required. The actual adjustment should take into account:

1) the duration of dialysis period, 2) the clearance rate of the dialysis system being used and 3) the effective renal clearance of topiramate in the patient being dialyzed [see Use in Specific Populations (8.7), Clinical Pharmacology (12.3)].

2.7 Administration Instructions
Topiramate extended-release capsules can be taken without regard to meals.

Swallow capsule whole and intact. Do not sprinkle on food, chew, or crush.

Table 1 Monotherapy Target Total Daily Maintenance Dosing for Patients 6 to 9 Years of Age
Weight (kg)	Total Daily Dose (mg/day) Minimum Maintenance Dose	Total Daily Dose (mg/day) Maximum Maintenance Dose
Up to 11	150	250
12 to 22	200	300
23 to 31	200	350
32 to 38	250	350
Greater than 38	250	400

3 Dosage Forms And Strengths

Topiramate extended-release capsules are available in the following strengths:

25 mg capsules: Off-white pellets filled in size '2' hard gelatin capsules with white opaque cap printed with '863' in black ink and a white opaque body.

50 mg capsules: Off-white pellets filled in size '0' hard gelatin capsules with white opaque cap printed with '864' in black ink and a white opaque body.

100 mg capsules: Off-white pellets filled in size '0el' hard gelatin capsules with white opaque cap printed with '769' in black ink and a white opaque body.

200 mg capsules:White to off-white pellets filled in size '00' hard gelatin capsules with white opaque cap printed with '358' in black ink and a white opaque body.

Extended-release capsules: 25 mg, 50 mg, 100 mg and 200 mg (3)

4 Contraindications

Topiramate extended-release capsules are contraindicated in patients:

With recent alcohol use (i.e., within 6 hours prior to and 6 hours after topiramate extended-release capsules use) [see Warnings and Precautions (5.5)]

With recent alcohol use, i.e., within 6 hours prior to and 6 hours after topiramate extended-release capsules use (4, 5.5)

5 Warnings And Precautions

Acute myopia and secondary angle closure glaucoma:can lead to permanent visual loss; discontinue topiramate extended-release capsules as soon as possible (5.1)

Visual field defects:consider discontinuation of topiramate extended-release capsules (5.2)

Oligohydrosis and hyperthermia:monitor decreased sweating and increased body temperature, especially in pediatric patients (5.3)

Metabolic acidosis:baseline and periodic measurement of serum bicarbonate is recommended; consider dose reduction or discontinuation of topiramate extended-release capsules if clinically appropriate (5.4)

Suicidal behavior and ideation:antiepileptic drugs increase the risk of suicidal behavior or ideation (5.6)

Cognitive/neuropsychiatric adverse reactions:use caution when operating machinery including cars; depression and mood problems may occur (5.7)

Fetal toxicity:use during pregnancy can cause cleft lip and/or palate and being small for gestational age (5.8)

Withdrawal of AEDs:withdraw topiramate extended-release capsules^{gradually (5.9)}

Decrease in Bone Mineral Density: has been shown to decrease bone mineral density and bone mineral content in pediatric patients (5.10)

Negative effects on growth (height and weight): may slow height increase and weight gain; carefully monitor children receiving prolonged therapy (5.11)

Serious skin reactions:If SJS or TEN is suspected, discontinue topiramate extended-release capsules (5.12)

Hyperammonemia/encephalopathy:measure ammonia if encephalopathic symptoms occur (5.13)

Kidney stones:avoid use with other carbonic anhydrase inhibitors, other drugs causing metabolic acidosis, or in patients on a ketogenic diet (5.14)

Hypothermia has been reported with and without hyperammonemia during topiramate treatment with concomitant valproic acid use (5.15)

5.1 Acute Myopia and Secondary Angle Closure Glaucoma Syndrome
A syndrome consisting of acute myopia associated with secondary angle closure glaucoma has been reported in patients receiving topiramate. Symptoms include acute onset of decreased visual acuity and/or ocular pain.

Ophthalmologic findings can include some or all of the following: myopia, mydriasis, anterior chamber shallowing, ocular hyperemia (redness), choroidal detachments, retinal pigment epithelial detachments, macular striae, and increased intraocular pressure. This syndrome may be associated with supraciliary effusion resulting in anterior displacement of the lens and iris, with secondary angle closure glaucoma. Symptoms typically occur within 1 month of initiating topiramate therapy. In contrast to primary narrow angle glaucoma, which is rare under 40 years of age, secondary angle closure glaucoma associated with topiramate has been reported in pediatric patients as well as adults. The primary treatment to reverse symptoms is discontinuation of topiramate extended-release capsules as rapidly as possible, according to the judgment of the treating physician. Other measures, in conjunction with discontinuation of topiramate extended-release capsules, may be helpful.

Elevated intraocular pressure of any etiology, if left untreated, can lead to serious sequelae including permanent vision loss.

5.2 Visual Field Defects
Visual field defects (independent of elevated intraocular pressure) have been reported in clinical trials and in postmarketing experience in patients receiving topiramate. In clinical trials, most of these events were reversible after topiramate discontinuation. If visual problems occur at any time during treatment with topiramate extended-release capsules, consideration should be given to discontinuing the drug.

5.3 Oligohydrosis and Hyperthermia
Oligohydrosis (decreased sweating), resulting in hospitalization in some cases, has been reported in association with topiramate use. Decreased sweating and an elevation in body temperature above normal characterized these cases. Some of the cases were reported after exposure to elevated environmental temperatures.

The majority of the reports have been in pediatric patients. Patients, especially pediatric patients, treated with topiramate extended-release capsules should be monitored closely for evidence of decreased sweating and increased body temperature, especially in hot weather. Caution should be used when topiramate extended-release capsules are given with other drugs that predispose patients to heat-related disorders; these drugs include, but are not limited to, other carbonic anhydrase inhibitors and drugs with anticholinergic activity.

5.4 Metabolic Acidosis
Topiramate extended-release capsules can cause hyperchloremic, non-anion gap, metabolic acidosis (i.e., decreased serum bicarbonate below the normal reference range in the absence of chronic respiratory alkalosis). This metabolic acidosis is caused by renal bicarbonate loss due carbonic anhydrase inhibition by topiramate extended-release capsules. Topiramate extended-release capsules-induced metabolic acidosis can occur at any time during treatment. Bicarbonate decrements are usually mild to moderate (average decrease of 4 mEq/L at daily doses of 400 mg in adults and at approximately 6 mg/kg/day in pediatric patients); rarely, patients can experience severe decrements to values below 10 mEq/L. Conditions or therapies that predispose patients to acidosis (such as renal disease, severe respiratory disorders, status epilepticus, diarrhea, ketogenic diet or specific drugs) may be additive to the bicarbonate lowering effects of topiramate extended-release capsules.

Metabolic acidosis was commonly observed in adult and pediatric patients treated with immediate-release topiramate in clinical trials. The incidence of decreased serum bicarbonate in pediatric trials for adjunctive treatment of Lennox-Gastaut syndrome or refractory partial onset seizures was as high as 67% for immediate-release topiramate (at approximately 6 mg/kg/day), and 10% for placebo. The incidence of a markedly abnormally low serum bicarbonate (i.e., absolute value <17 mEq/L and >5mEq/L decrease from pretreatment) in these trials was up to 11%, compared to <2% for placebo.

Manifestations of acute or chronic metabolic acidosis may include hyperventilation, nonspecific symptoms such as fatigue and anorexia, or more severe sequelae including cardiac arrhythmias or stupor. Chronic, untreated metabolic acidosis may increase the risk for nephrolithiasis or nephrocalcinosis, and may also result in osteomalacia (referred to as rickets in pediatric patients) and/or osteoporosis with an increased risk for fractures [see Warnings and Precautions (5.10, 5.14)]. A one-year, active-controlled study of pediatric patients treated with immediate-release topiramate demonstrated that immediate-release topiramate decreased lumbar spine bone mineral density and that this lumbar spine bone mineral density decrease was correlated (using change from baseline for lumbar spine Z score at final visit versus lowest post-treatment serum bicarbonate) with decreased serum bicarbonate, a reflection of metabolic acidosis [see Warnings and Precautions (5.10), Use in Specific Populations (8.4)]. Chronic metabolic acidosis in pediatric patients may also reduce growth rates, which may decrease the maximal height achieved. Long-term, open-label treatment of pediatric patients 1 to 24 months old with intractable partial epilepsy, for up to 1 year, showed reductions from baseline in length, weight, and head circumference compared to age and sex-matched normative data, although these patients with epilepsy are likely to have different growth rates than normal 1 to 24 month old pediatrics. Reductions in length and weight were correlated to the degree of acidosis [see Use in Specific Populations (8.4)]. Topiramate extended-release capsules treatment that causes metabolic acidosis during pregnancy can possibly produce adverse effects on the fetus and might also cause metabolic acidosis in the neonate from possible transfer of topiramate to the fetus [see Warnings and Precautions (5.8) and Use in Specific Populations (8.1)].

Measurement of Serum Bicarbonate in Epilepsy and Migraine Patients

Measurement of baseline and periodic serum bicarbonate during topiramate treatment is recommended. If metabolic acidosis develops and persists, consideration should be given to reducing the dose or discontinuing topiramate extended-release capsules (using dose tapering). If the decision is made to continue patients on topiramate extended-release capsules in the face of persistent acidosis, alkali treatment should be considered.

5.5 Interaction With Alcohol
In vitro data show that, in the presence of alcohol, the pattern of topiramate release from topiramate extended-release capsules is significantly altered. As a result, plasma levels of topiramate with topiramate extended-release capsules may be markedly higher soon after dosing and subtherapeutic later in the day. Therefore, alcohol use should be completely avoided within 6 hours prior to and 6 hours after topiramate extended-release capsules administration.

5.6 Suicidal Behavior and Ideation
Antiepileptic drugs (AEDs) increase the risk of suicidal thoughts or behavior in patients taking these drugs for any indication. Patients treated with any AED, including topiramate extended-release capsules for any indication should be monitored for the emergence or worsening of depression, suicidal thoughts or behavior, and/or any unusual changes in mood or behavior.

Pooled analyses of 199 placebo-controlled clinical trials (mono- and adjunctive therapy) of 11 different AEDs showed that patients randomized to one of the AEDs had approximately twice the risk (adjusted Relative Risk 1.8, 95% CI:1.2, 2.7) of suicidal thinking or behavior compared to patients randomized to placebo. In these trials, which had a median treatment duration of 12 weeks, the estimated incidence rate of suicidal behavior or ideation among 27,863 AED-treated patients was 0.43%, compared to 0.24% among 16,029 placebo-treated patients, representing an increase of approximately one case of suicidal thinking or behavior for every 530 patients treated. There were four suicides in drug-treated patients in the trials and none in placebo-treated patients, but the number is too small to allow any conclusion about drug effect on suicide.

The increased risk of suicidal thoughts or behavior with AEDs was observed as early as one week after starting drug treatment with AEDs and persisted for the duration of treatment assessed. Because most trials included in the analysis did not extend beyond 24 weeks, the risk of suicidal thoughts or behavior beyond 24 weeks could not be assessed.

The risk of suicidal thoughts or behavior was generally consistent among drugs in the data analyzed. The finding of increased risk with AEDs of varying mechanisms of action and across a range of indications suggests that the risk applies to all AEDs used for any indication. The risk did not vary substantially by age (5 to 100 years) in the clinical trials analyzed.

Table 2 shows absolute and relative risk by indication for all evaluated AEDs.

Table 2 Risk by Indication for Antiepileptic Drugs in the Pooled Analysis

Indication Placebo Patients with Events per 1,000 Patients Drug Patients with Events per 1,000 Patients Relative Risk: Incidence of Events in Drug Patients/ Incidence in Placebo Patients Risk Difference: Additional Drug Patients with Events per 1,000 Patients

Epilepsy 1 3.4 3.5 2.4

Psychiatric 5.7 8.5 1.5 2.9

Other 1 1.8 1.9 0.9

Total 2.4 4.3 1.8 1.9

The relative risk for suicidal thoughts or behavior was higher in clinical trials for epilepsy than in clinical trials for psychiatric or other conditions, but the absolute risk differences were similar for the epilepsy and psychiatric indications.

Anyone considering prescribing topiramate extended-release capsules or any other AED must balance the risk of suicidal thoughts or behavior with the risk of untreated illness. Epilepsy and many other illnesses for which AEDs are prescribed are themselves associated with morbidity and mortality and an increased risk of suicidal thoughts and behavior. Should suicidal thoughts and behavior emerge during treatment, the prescriber needs to consider whether the emergence of these symptoms in any given patient may be related to the illness being treated.

5.7 Cognitive/Neuropsychiatric Adverse Reactions
Immediate-release topiramate can cause, and therefore expected to be caused by topiramate extended-release capsulese, cognitive/neuropsychiatric adverse reactions. The most frequent of these can be classified into three general categories: 1) Cognitive-related dysfunction (e.g., confusion, psychomotor slowing, difficulty with concentration/attention, difficulty with memory, speech or language problems, particularly word-finding difficulties); 2) Psychiatric/behavioral disturbances (e.g.,depression or mood problems); and 3) Somnolence or fatigue.

Adult Patients

Cognitive-Related Dysfunction

Rapid titration rate and higher initial dose were associated with higher incidences of cognitive-related dysfunction.

In adult adjunctive epilepsy controlled trials, which used rapid titration (100 mg/day to 200 mg/day weekly increments), and target immediate-release topiramate doses of 200 mg to 1000 mg/day, 56% of patients in the 800 mg/day and 1000 mg/day dose groups experienced cognitive-related dysfunction compared to approximately 42% of patients in the 200 mg/day to 400 mg/day groups and 14% for placebo. In this rapid titration regimen, these dose-related adverse reactions began in the titration or in the maintenance phase, and in some patients these events began during titration and persisted into the maintenance phase.

In the monotherapy epilepsy controlled trial conducted with immediate-release topiramate, the proportion of patients who experienced one or more cognitive-related adverse reactions was 19% for topiramate 50 mg per day and 26% for 400 mg per day.

In the 6-month controlled trials for the preventive treatment of migraine with immediate release topiramate using a slower titration regimen (25mg per day weekly increments), the proportion of patients who experienced one or more cognitive-related adverse reactions was 19% for topiramate 50 mg per day, 22% for 100 mg per day (the recommended dose), 28% for 200 mg per day and 10% for placebo. Cognitive adverse reactions most commonly developed during titration and sometimes persisted after completion of titration.

Psychiatric/Behavioral Disturbances

Psychiatric/behavioral disturbances (e.g., depression, mood) were dose-related for both the adjunctive epilepsy and migraine populations treated with topiramate [see Warnings and Precautions (5.6)].

Somnolence/Fatigue

Somnolence and fatigue were the adverse reactions most frequently reported during clinical trials of topiramate for adjunctive epilepsy. For the adjunctive epilepsy population, the incidence of fatigue was dose-related. For the monotherapy epilepsy population, the incidence of somnolence was dose-related. For the migraine population, the incidences of both somnolence and fatigue were dose-related and more common in the titration phase.

Pediatric Patients

In pediatric epilepsy trials (adjunctive and monotherapy) conducted with topiramate, the incidence of cognitive/neuropsychiatric adverse reactions in pediatric patients was generally lower than that observed in adults. These reactions included psychomotor slowing, difficulty with concentration/attention, speech disorders/related speech problems and language problems. The most frequently reported neuropsychiatric reactions in pediatric epilepsy patients during adjunctive therapy double-blind studies were somnolence and fatigue. The most frequently reported cognitive/neuropsychiatric reactions in pediatric epilepsy patients in the 50 mg/day and 400 mg/day groups during the monotherapy double-blind study were headache, dizziness, anorexia, and somnolence.

In pediatric migraine patients, the incidence of cognitive/neuropsychiatric adverse reactions was increased in immediate-release topiramate-treated patients compared to placebo.

The risk for cognitive/neuropsychiatric adverse reactions was dose-dependent, and was greatest at the highest dose (200 mg). This risk for cognitive/neuropsychiatric adverse reactions was also greater in younger patients (6 to 11 years of age) than in older patients (12 to 17 years of age). The most common cognitive/neuropsychiatric adverse reaction in these trials was difficulty with concentration/attention. Cognitive adverse reactions most commonly developed during titration and sometimes persisted for various durations after completion of titration. The Cambridge Neuropsychological Test Automated Battery (CANTAB) was administered to adolescents (12 to 17 years of age) to assess the effects of topiramate on cognitive function at baseline at the end of the Study 3 [see Clinical Studies (14.4)]. Mean change from baseline in certain CANTAB tests suggests that topiramate treatment may result in psychomotor slowing and decreased verbal fluency.

5.8 Fetal Toxicity
Topiramate extended-release capsules can cause fetal harm when administered to a pregnant woman. Data from pregnancy registries indicate that infants exposed to topiramate in utero have an increased risk for cleft lip and/or cleft palate (oral clefts) and for being small for gestational age. When multiple species of pregnant animals received topiramate at clinically relevant doses, structural malformations, including craniofacial defects, and reduced fetal weights occurred in offspring [see Use in Specific Populations (8.1)].

Consider the benefits and risks of topiramate extended-release capsules when administering the drug in women of childbearing potential, particularly when topiramate extended-release capsules are considered for a condition not usually associated with permanent injury or death [see Use in Specific Populations (8.1)]. Topiramate extended-release capsules should be used during pregnancy only if the potential benefit outweighs the potential risk. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be informed of the potential hazard to a fetus [see Use in Specific Populations (8.1)].

5.9 Withdrawal of Antiepileptic Drugs
In patients with or without a history of seizures or epilepsy, antiepileptic drugs, including topiramate extended-release capsules, should be gradually withdrawn to minimize the potential for seizures or increased seizure frequency [see Clinical Studies (14)]. In situations where rapid withdrawal of topiramate extended-release capsules is medically required, appropriate monitoring is recommended.

5.10 Decrease in Bone Mineral Density
Results of a one-year active-controlled study in pediatric patients (N=63) demonstrated negative effects of immediate-release topiramate monotherapy on bone mineral acquisition via statistically significant decreases in bone mineral density (BMD) measured in lumbar spine and in total body less head [see Use in Specific Populations (8.4)]. Twenty-one percent of immediate-release topiramate-treated patients experienced clinically important reductions in BMD (Z score change from baseline of -0.5 or greater) compared to 0 patients in the control group. Although decreases in BMD occurred across all pediatric age subgroups, patients 6 to 9 years of age were most commonly affected. The sample size and study duration were too small to determine if fracture risk is increased. Decreased BMD in the lumbar spine was correlated with decreased serum bicarbonate, which commonly occurs with topiramate treatment and reflects metabolic acidosis, a known cause of increased bone resorption [see Warnings and Precautions (5.4)]. Although small decreases in some markers of bone metabolism (e.g., serum alkaline phosphatase, calcium, phosphorus, and 1,25-dihydroxyvitamin D) occurred in immediate-release topiramate-treated patients, more significant decreases in serum parathyroid hormone and 25-hydroxyvitamin D, hormones involved in bone metabolism, were observed, along with an increased excretion of urinary calcium.

5.11 Negative Effects on Growth (Height and Weight)
Results of a one-year active-controlled study of pediatric patients (N=63) demonstrated negative effects of immediate-release topiramate monotherapy on growth (i.e., height and weight) [see Use in Specific Populations (8.4)]. Although continued growth was observed in both treatment groups, the immediate-release topiramate group showed statistically significant reductions in mean annual change from baseline in body weight compared to the control group. A similar trend of attenuation in height velocity and height change from baseline was also observed in the immediate-release topiramate group compared to the control group. Negative effects on weight and height were seen across all immediate-release topiramate age subgroups. Growth (height and weight) of children receiving prolonged Topiramate extended-release capsules therapy should be carefully monitored.

5.12 Serious Skin Reactions
Serious skin reactions (Stevens-Johnson Syndrome [SJS] and Toxic Epidermal Necrolysis [TEN]) have been reported in patients receiving topiramate. Topiramate extended-release capsules should be discontinued at the first sign of a rash, unless the rash is clearly not drug-related. If signs or symptoms suggest SJS/TEN, use of this drug should not be resumed and alternative therapy should be considered. Inform patients about the signs of serious skin reactions.

5.13 Hyperammonemia and Encephalopathy (Without and With Concomitant Valproic Acid Use)
Topiramate treatment can cause hyperammonemia with or without encephalopathy [see Adverse Reactions (6.2)]. The risk for hyperammonemia with topiramate appears dose-related. Hyperammonemia has been reported more frequently when topiramate is used concomitantly with valproic acid. Postmarketing cases of hyperammonemia with or without encephalopathy have been reported with topiramate and valproic acid in patients who previously tolerated either drug alone [see Drug Interactions (7.2)].

Clinical symptoms of hyperammonemic encephalopathy often include acute alterations in level of consciousness and/or cognitive function with lethargy and/or vomiting. In most cases, hyperammonemic encephalopathy abated with discontinuation of treatment.

The incidence of hyperammonemia in pediatric patients 12 years to 17 years of age in the preventive treatment of migraine trials was 26% in patients taking topiramate monotherapy at 100 mg/day and 14% in patients taking topiramate at 50 mg/day, compared to 9% in patients taking placebo. There was also an increased incidence of markedly increased hyperammonemia at the 100 mg dose.

Dose-related hyperammonemia was also seen in pediatric patients 1 month to 24 months of age treated with topiramate and concomitant valproic acid for partial onset epilepsy and this was not due to a pharmacokinetic interaction.

In some patients, hyperammonemia can be asymptomatic.

Monitoring for Hyperammonemia

Patients with inborn errors of metabolism or reduced hepatic mitochondrial activity may be at an increased risk for hyperammonemia with or without encephalopathy. Although not studied, topiramate or topiramate extended-release capsules treatment or an interaction of concomitant topiramate-based product and valproic acid treatment may exacerbate existing defects or unmask deficiencies in susceptible persons.

In patients who develop unexplained lethargy, vomiting or changes in mental status associated with any topiramate treatment, hyperammonemic encephalopathy should be considered and an ammonia level should be measured.

5.14 Kidney Stones
Topiramate increases the risk of kidney stones. During adjunctive epilepsy trials, the risk for kidney stones in immediate-release topiramate-treated adults was 1.5%, an incidence about 2 times to 4 times greater than expected in a similar, untreated population. As in the general population, the incidence of stone formation among topiramate-treated patients was higher in men. Kidney stones have also been reported in pediatric patients taking topiramate for epilepsy or migraine. During long-term (up to 1 year) topiramate treatment in an open-label extension study of 284 pediatric patients 1 month to 24 months old with epilepsy, 7% developed kidney or bladder stones. Topiramate extended-release capsules would be expected to have the same effect as immediate-release topiramate on the formation of kidney stones. Topiramate extended-release capsules are not approved for treatment of epilepsy in pediatric patients less than 6 years old [see Use in Specific Populations (8.4)].

Topiramate is a carbonic anhydrase inhibitor. Carbonic anhydrase inhibitors can promote stone formation by reducing urinary citrate excretion and by increasing urinary pH [see Warnings and Precautions (5.4)]. The concomitant use of topiramate extended-release capsules with any other drug producing metabolic acidosis or potentially in patients on a ketogenic diet, may create a physiological environment that increases the risk of kidney stone formation and should therefore be avoided.

Increased fluid intake increases the urinary output, lowering the concentration of substances involved in stone formation. Hydration is recommended to reduce new stone formation.

An increase in urinary calcium and a marked decrease in urinary citrate was observed in immediate-release topiramate-treated pediatric patients in a one-year active-controlled study [see Use in Specific Populations (8.4)]. This increased ratio of urinary calcium/citrate increases the risk of kidney stones and/or nephrocalcinosis.

5.15 Hypothermia With Concomitant Valproic Acid Use
Hypothermia, defined as a drop in body core temperature to < 35ºC (95ºF), has been reported in association with topiramate use with concomitant valproic acid (VPA) both in conjunction with and in the absence of hyperammonemia. This adverse reaction in patients using concomitant topiramate and valproate can occur after starting topiramate treatment or after increasing the daily dose of topiramate [see Drug Interactions (7.2)]. Consideration should be given to stopping topiramate extended-release capsules or valproate in patients who develop hypothermia, which may be manifested by a variety of clinical abnormalities including lethargy, confusion, coma and significant alterations in other major organ systems such as the cardiovascular and respiratory systems. Clinical management and assessment should include examination of blood ammonia levels.

6 Adverse Reactions

The following serious adverse reactions are discussed in more detail in other sections of the labeling:

Acute Myopia and Secondary Angle Closure Glaucoma [see Warnings and Precautions (5.1)]

Visual Field Defects [see Warnings and Precautions (5.2)]

Oligohydrosis and Hyperthermia [see Warnings and Precautions (5.3)]

Metabolic Acidosis [see Warnings and Precautions (5.4)]

Interaction With Alcohol [see Warnings and Precautions (5.5)]

Suicidal Behavior and Ideation [see Warnings and Precautions (5.6)]

Cognitive/Neuropsychiatric Adverse Reactions [see Warnings and Precautions (5.7)]

Fetal Toxicity [see Warnings and Precautions (5.8)]

Withdrawal of Antiepileptic Drugs [see Warnings and Precautions (5.9)]

Decrease of Bone Mineral Density [see Warnings and Precautions (5.10)]

Negative Effects on Growth (Height and Weight)[see Warnings and Precautions (5.11)]

Serious Skin Reactions [see Warnings and Precautions (5.12)]

Hyperammonemia and Encephalopathy (Without and With Concomitant Valproic Acid Use) [see Warnings and Precautions (5.13)]

Kidney Stones [see Warnings and Precautions (5.14)]

Hypothermia With Concomitant Valproic Acid Use [see Warnings and Precautions (5.15)]

The data described in the following sections were obtained using immediate-release topiramate tablets. Topiramate extended-release capsules have not been studied in a randomized, placebo-controlled Phase III clinical study; however, it is expected that topiramate extended-release capsules would produce a similar adverse reaction profile as immediate-release topiramate.

Epilepsy: Most common (≥10% more frequent than placebo or low-dose topiramate adverse reactions in adult and pediatric patients were paresthesia, anorexia, weight loss, speech disorders/related speech problems, fatigue, dizziness, somnolence, nervousness, psychomotor slowing, abnormal vision, and fever (6.1).

Migraine: Most common (≥5% more frequent than placebo) adverse reactions in adult and pediatric patients were: paresthesia, anorexia, weight loss, difficulty with memory, taste perversion, diarrhea, hypoesthesia, nausea, abdominal pain, and upper respiratory tract infection (6.1).

To report SUSPECTED ADVERSE REACTIONS, contact Zydus Pharmaceuticals (USA) Inc. at 1- 877-993-8779 or the FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug, and may not reflect the rates observed in practice.

Monotherapy Epilepsy

Adults 16 Years of Age and Older

The most common adverse reactions in the controlled trial (Study 1) that occurred in adults in the 400 mg /day topiramate group and at an incidence higher (≥ 10%) than in the 50 mg per day group were: paresthesia, weight loss, and anorexia (see Table 3).

Approximately 21% of the 159 adult patients in the 400 mg /day group who received topiramate as monotherapy in Study 1 discontinued therapy due to adverse reactions. The most common (≥ 2% more frequent than low-dose 50 mg/day topiramate) adverse reactions causing discontinuation were difficulty with memory, fatigue, asthenia, insomnia, somnolence, and paresthesia.

Pediatric Patients 6 Years to 15 Years of Age

The most common adverse reactions in the controlled trial (Study 1) that occurred in pediatric patients in the 400 mg /day topiramate group and at an incidence higher (≥ 10%) than in the 50 mg/day group were fever and weight loss (see Table 3).

Approximately 14% of the 77 pediatric patients in the 400 mg/day group who received topiramate as monotherapy in the controlled clinical trial discontinued therapy due to adverse reactions. The most common (≥ 2% more frequent than in the 50 mg/day group) adverse reactions resulting in discontinuation in this trial were difficulty with concentration/attention, fever, flushing, and confusion.

Table 3 represents the incidence of adverse reactions occurring in at least 3% of adult and pediatric patients treated with 400 mg/day immediate-release topiramate and occurring with greater incidence than 50 mg/day topiramate.

Table 3 Adverse Reactions in the High Dose Group as Compared to the Low Dose Group, in Monotherapy Epilepsy Trial in Adult and Pediatric Patients

Body System/ Adverse Reaction Age Group

Pediatric (6 to 15 Years) Adult (Age ≥16 Years)

Immediate-release Topiramate Daily Dosage Group (mg/day)

50 400 50 400

(N=74) % (N=77) % (N=160) % (N=159) %

Body as a Whole-General Disorders

Asthenia 0 3 4 6

Fever 1 12

Leg pain 2 3

Central & Peripheral Nervous System Disorders

Paresthesia 3 12 21 40

Dizziness 13 14

Ataxia 3 4

Hypoesthesia 4 5

Hypertonia 0 3

Involuntary Muscle contraction 0 3

Vertigo 0 3

Gastro-Intestinal System Disorders

Constipation 1 4

Diarrhea 8 9

Gastritis 0 3

Dry mouth 1 3

Liver and Biliary System Disorders

Increase in Gamma-GT 1 3

Metabolic and Nutritional Disorders

Weight loss 7 17 6 17

Platelet, Bleeding & Clotting Disorders

Epistaxis 0 4

Psychiatric Disorders

Anorexia 4 14

Anxiety 4 6

Cognitive problems 1 6 1 4

Confusion 0 3

Depression 0 3 7 9

Difficulty with concentration or attention 7 10 7 8

Difficulty with memory 1 3 6 11

Insomnia 8 9

Decrease in libido 0 3

Mood problems 1 8 2 5

Personality disorder (behavior problems) 0 3

Psychomotor slowing 3 5

Somnolence 10 15

Red Blood Cell Disorders

Anemia 1 3

Reproductive Disorders, Female

Intermenstrual bleeding 0 3

Vaginal hemorrhage 0 3

Resistance Mechanism Disorders

Infection 3 8 2 3

Viral infection 3 6 6 8

Respiratory System Disorders

Bronchitis 1 5 3 4

Upper respiratory tract infection 16 18

Rhinitis 5 6 2 4

Sinusitis 1 4

Skin and Appendages Disorders

Alopecia 1 4 3 4

Pruritus 1 4

Rash 3 4 1 4

Acne 2 3

Special Senses Other, Disorders

Taste perversion 3 5

Urinary System Disorders

Cystitis 1 3

Micturition frequency 0 3 0 2

Renal calculus 0 3

Urinary incontinence 1 3

Vascular (Extracardiac) Disorders

Flushing 0 5

Adjunctive Therapy Epilepsy

Adults 16 Years of Age and Older

In pooled controlled clinical trials in adults with partial-onset seizures, primary generalized tonic-clonic seizures, or Lennox-Gastaut syndrome, 183 patients received adjunctive therapy with immediate-release topiramate at dosages of 200 mg/day to 400 mg/day (recommended dosage range), and 291 patients received placebo. Patients in these trials were receiving 1 to 2 concomitant antiepileptic drugs in addition to immediate-release topiramate or placebo.

The most common adverse reactions in the controlled clinical trial that occurred in adult patients in the 200 mg/day to 400 mg/day topiramate group with an incidence higher (>10%) than in the placebo group were: dizziness, speech disorders/related speech problems, somnolence, nervousness, psychomotor slowing, and vision abnormal (see Table 4) [see Clinical Studies (14.3)].

Table 4 presents the incidence of adverse reactions occurring in at least 3% of adult patients treated with 200 mg/day to 400 mg/day topiramate and was greater than placebo incidence. The incidence of some adverse reactions (e.g., fatigue, dizziness, paresthesia, language problems, psychomotor slowing, depression, difficulty with concentration/attention, mood problems) was dose-related and much greater at higher than recommended topiramate dosing (i.e., 600 mg/day to 1000 mg/day) compared to the incidence of these adverse reactions at the recommended dosing (200 mg/day to 400 mg/day) range.

Table 4 Most Common Adverse Reactions in Pooled Placebo-Controlled, Adjunctive Epilepsy Trials in Adults^{*, †}
^* Patients in these adjunctive trials were receiving 1 to 2 concomitant antiepileptic drugs in addition to topiramate or placebo

^† Values represent the percentage of patients reporting a given reaction. Patient may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category.

Body System/ Adverse Reaction Placebo (N = 291) % Topiramate Dosage (mg per day) 200 to 400 (N = 183) %

Body as a Whole-General Disorders

Fatigue 13 15

Asthenia 1 6

Back pain 4 5

Chest pain 3 4

Influenza-like symptoms 2 3

Central & Peripheral Nervous System Disorders

Dizziness 15 25

Ataxia 7 16

Speech disorders/Related speech problems 2 13

Paresthesia 4 11

Nystagmus 7 10

Tremor 6 9

Language problems 1 6

Coordination abnormal 2 4

Gait abnormal 1 3

Gastro-Intestinal System Disorders

Nausea 8 10

Dyspepsia 6 7

Abdominal pain 4 6

Constipation 2 4

Metabolic and Nutritional Disorders

Weight loss 3 9

Psychiatric Disorders

Somnolence 12 29

Nervousness 6 16

Psychomotor slowing 2 13

Difficulty with memory 3 12

Confusion 5 11

Anorexia 4 10

Difficulty with concentration/attention 2 6

Mood problems 2 4

Agitation 2 3

Aggressive reaction 2 3

Emotional liability 1 3

Cognitive problems 1 3

Reproductive Disorders, Female

Breast pain 2 4

Respiratory System Disorders

Pharyngitis 2 6

Rhinitis 6 7

Sinusitis 4 5

Vision Disorders

Vision abnormal 2 13

Diplopia 5 10

In controlled clinical trials in adults, 11% of patients receiving immediate-release topiramate 200 to 400 mg per day as adjunctive therapy discontinued due to adverse reactions. This rate appeared to increase at dosages above 400 mg per day. Adverse reactions associated with discontinuing therapy included somnolence, dizziness, anxiety, difficulty with concentration or attention, fatigue, and paresthesia.

Pediatric Patients 2 to 15 Years of Age

In pooled, controlled clinical trials in pediatric patients (2 to 15 years of age) with partial-onset seizures, primary generalized tonic-clonic seizures, or Lennox-Gastaut syndrome, 98 patients received adjunctive therapy with immediate-release topiramate at dosages of 5 mg to 9 mg/kg/day (recommended dosage range) and 101 patients received placebo.

The most common adverse reactions in the controlled clinical trial that occurred in pediatric patients in the 5 mg to 9 mg/kg/day immediate-release topiramate group with an incidence higher (>10%) than in the placebo group were: fatigue and somnolence (see Table 5).

Table 5 presents the incidence of adverse reactions that occurred in at least 3% of pediatric patients 2 to 15 years of age receiving 5 mg to 9 mg/kg/day (recommended dosage range) of immediate-release topiramate and was greater than placebo incidence.

Table 5 Adverse Reactions in Pooled Placebo-Controlled, Adjunctive Epilepsy Trial in Pediatric Patients 2 to 15 Years of Age^*,†
^* Patients in these adjunctive trials were receiving 1 to 2 concomitant antiepileptic drugs in addition to topiramate or placebo

^† Values represent the percentage of patients reporting a given adverse reaction. Patients may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category

Body System/Adverse Reaction Placebo (N=101) % 200 (N=98) %

Body as a Whole-General Disorders

Fatigue 5 16

Injury 13 14

Central & Peripheral Nervous System Disorders

Gait abnormal 5 8

Ataxia 2 6

Hyperkinesia 4 5

Dizziness 2 4

Speech disorders/Related speech problems 2 4

Gastro-Intestinal System Disorders

Nausea 5 6

Saliva increased 4 6

Constipation 4 5

Gastroenteritis 2 3

Metabolic and Nutritional Disorders

Weight loss 1 9

Platelet, Bleeding & Clotting Disorders

Purpura 4 8

Epistaxis 1 4

Psychiatric Disorders

Somnolence 16 26

Anorexia 15 24

Nervousness 7 14

Personality disorder (Behavior Problems) 9 11

Difficulty with concentration/attention 2 10

Aggressive reaction 4 9

Insomnia 7 8

Difficulty with memory 0 5

Confusion 3 4

Psychomotor slowing 2 3

Resistance Mechanism Disorders

Infection viral 3 7

Respiratory System Disorders

Pneumonia 1 5

Skin and Appendages Disorders

Skin Disorder 2 3

Urinary System Disorders

Urinary incontinence 2 4

None of the pediatric patients who received topiramate adjunctive therapy at 5 mg/kg/day to 9 mg/kg/day in controlled clinical trials discontinued due to adverse reactions.

Migraine

Adults

In the four multicenter, randomized, double-blind, placebo-controlled, parallel group clinical trials for the preventive treatment of migraine (which included 35 pediatric patients 12 to 15 years of age), most adverse reactions occurred more frequently during the titration period than during the maintenance period.

The most common adverse reactions with immediate-release topiramate 100mg in the clinical trials for the preventive treatment of migraine of predominantly adults that were seen at an incidence higher (≥5%) than in the placebo group were: paresthesia, anorexia, weight loss, taste perversion, diarrhea, difficulty with memory, hypoesthesia, and nausea (see Table 6).

Table 6 includes those adverse reactions that occurred in the placebo-controlled trials where the incidence in any immediate-release topiramate group was at least 3% and was greater than that for placebo patients. The incidence of some adverse reactions (e.g., fatigue, dizziness, somnolence, difficulty with memory, difficulty with concentration/attention) was dose-related and greater at higher than recommended topiramate dosing (200 mg/day) compared to the incidence of these adverse reactions at the recommended dosing (100 mg/day).

Table 6 Adverse Reactions in Pooled, Placebo-Controlled, Migraine Trials in Adults^*,†,‡
^* Includes 35 adolescent patients age 12 to 15 years

^† Values represent the percentage of patients reporting a given reaction. Patients may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category.

^‡ Blurred vision was the most common term considered as vision abnormal. Blurred vision was an included term that accounted for more than 50% of reactions coded as vision abnormal, a preferred term

Body System/ Adverse Reaction Placebo (N = 445) % Topiramate Dosage (mg/day)

50 (N = 235) % 100 (N = 386) %

Body as a Whole-General Disorders

Fatigue 11 14 15

Injury 7 9 6

Central & Peripheral Nervous System Disorders

Paresthesia 6 35 51

Dizziness 10 8 9

Hypoaesthesia 2 6 7

Language problems 2 7 6

Gastro-Intestinal System Disorders

Nausea 8 9 13

Diarrhea 4 9 11

Abdominal pain 5 6 6

Dyspepsia 3 4 5

Dry mouth 2 2 3

Gastroenteritis 1 3 3

Metabolic and Nutritional Disorders

Weight loss 1 6 9

Musculoskeletal System Disorders

Arthralgia 2 7 3

Psychiatric Disorders

Anorexia 6 9 15

Somnolence 5 8 7

Difficulty with memory 2 7 7

Insomnia 5 6 7

Difficulty with concentration/attention 2 3 6

Mood problems 2 3 6

Anxiety 3 4 5

Depression 4 3 4

Nervousness 2 4 4

Confusion 2 2 3

Psychomotor slowing 1 3 2

Reproductive Disorders, Female

Menstrual disorder 2 3 2

Reproductive Disorders, Male

Ejaculation premature 0 3 0

Resistance Mechanism Disorders

Viral infection 3 4 4

Respiratory System Disorders

Upper respiratory tract infection 12 13 14

Sinusitis 6 10 6

Pharyngitis 4 5 6

Coughing 2 2 4

Bronchitis 2 3 3

Dyspnea 2 1 3

Skin and Appendages Disorders

Pruritis 2 4 2

Special Senses Other, Disorders

Taste perversion 1 15 8

Urinary System Disorders

Urinary tract infection 2 4 2

Vision Disorders

Blurred vision 2 4 2

Of the 1135 patients exposed to immediate-release topiramate in the adult placebo-controlled studies, 25% discontinued due to adverse reactions, compared to 10% of the 445 placebo patients. The adverse reactions associated with discontinuing therapy in the immediate-release topiramate-treated patients in these studies included paresthesia (7%), fatigue (4%), nausea (4%), difficulty with concentration/attention (3%), insomnia (3%), anorexia (2%), and dizziness (2%).

Patients treated in these studies experienced mean percent reductions in body weight that were dose-dependent. This change was not seen in the placebo group. Mean changes of 0%, -2%, -3%, and -4% were seen for the placebo group, immediate-release topiramate 50 mg, 100 mg, and 200 mg groups, respectively.

Pediatric Patients 12 to 17 Years of Age

In five randomized, double-blind, placebo-controlled, parallel group clinical trials for the preventive treatment of migraine, clinical trials, most of the adverse reactions occurred more frequently during the titration period than during the maintenance period. Among adverse reactions with onset during titration, approximately half persisted into the maintenance period.

In four, fixed-dose, double-blind clinical trials for the preventive treatment of migraine in pediatric patients 12 to 17 years of age, the most common adverse reactions with immediate-release topiramate 100mg that were seen at an incidence higher (>5%) than in the placebo group were: paresthesia, upper respiratory tract infection, anorexia, and abdominal pain (see Table 7). Table 7 shows adverse reactions from the pediatric trial (Study 13 [see Clinical Studies (14.4)]) in which 103 pediatric patients were treated with placebo or 50 mg or 100 mg of immediate-release topiramate, and three predominantly adult trials in which 49 pediatric patients (12 to 17 years) were treated with placebo or 50 mg, 100 mg or 200 mg of immediate-release topiramate [see Clinical Studies (14.4)]. Table 7 also shows adverse reactions in pediatric patients in controlled migraine trials when the incidence in an immediate-release topiramate dose group was at least 5% or higher and greater than the incidence of placebo. Many adverse reactions shown in Table 7 indicate a dose-dependent relationship. The incidence of some adverse reactions (e.g., allergy, fatigue, headache, anorexia, insomnia, somnolence, and viral infection) was dose-related and greater at higher than recommended immediate-release topiramate dosing (200 mg daily) compared to the incidence of these adverse reactions at the recommended dosing (100 mg daily).

Table 7 Adverse Reactions in Pooled Double-Blind Studies for the Preventive Treatment of Migraine in Pediatric Patients 12 to 17 Years of Age)^*†
^* 35 adolescent patients aged 12 to <16 years were also included in adverse reaction assessment for adults

^† ^{Incidence is based on the number of subjects experiencing at least 1 adverse event, not the number of events.}

Body System/ Adverse Reaction Placebo (N=45) % Immediate-Release Topiramate Dosage

50 mg/day (N=46) % 100 mg/day (N=48) %

Body as a Whole – General Disorders

Fatigue 7 7 8

Fever 2 4 6

Central & Peripheral Nervous System Disorders

Paresthesia 7 20 19

Dizziness 4 4 6

Gastro-Intestinal System Disorders

Abdominal pain 9 7 15

Nausea 4 4 8

Metabolic and Nutritional Disorders

Weight loss 2 7 4

Psychiatric Disorders

Anorexia 4 9 10

Somnolence 2 2 6

Insomnia 2 9 2

Resistance Mechanism Disorders

Infection viral 4 4 8

Respiratory System Disorders

Upper respiratory tract infection 11 26 23

Rhinitis 2 7 6

Sinusitis 2 9 4

Coughing 0 7 2

Special Sense Other, Disorders

Taste perversion 2 2 6

Vision Disorders

Conjunctivitis 4 7 4

In the double-blind placebo-controlled studies, adverse reactions led to discontinuation of treatment in 8% of placebo patients compared with 6% of immediate-release topiramate-treated patients. Adverse reactions associated with discontinuing therapy that occurred in more than one immediate-release topiramate-treated patient were fatigue (1%), headache (1%), and somnolence (1%).

Increased Risk for Bleeding

Topiramate is associated with an increased risk for bleeding. In a pooled analysis of placebo-controlled studies of approved and unapproved indications, bleeding was more frequently reported as an adverse reaction for topiramate than for placebo (4.5% versus 3.0% in adult patients, and 4.4% versus 2.3% in pediatric patients). In this analysis, the incidence of serious bleeding events for topiramate and placebo was 0.3% versus 0.2% for adult patients, and 0.4% versus 0% for pediatric patients.

Adverse bleeding reactions reported with topiramate ranged from mild epistaxis, ecchymosis, and increased menstrual bleeding to life-threatening hemorrhages. In patients with serious bleeding events, conditions that increased the risk for bleeding were often present, or patients were often taking drugs that cause thrombocytopenia (other antiepileptic drugs) or affect platelet function or coagulation (e.g., aspirin, nonsteroidal anti-inflammatory drugs, selective serotonin reuptake inhibitors, or warfarin or other anticoagulants).

Other Adverse Reactions Observed During Clinical Trials

Other adverse reactions seen during clinical trials were: abnormal coordination, eosinophilia, gingival bleeding, hematuria, hypotension, myalgia, myopia, postural hypotension, scotoma, suicide attempt, syncope, and visual field defect.

Laboratory Test Abnormalities

Adult Patients

In addition to changes in serum bicarbonate (i.e., metabolic acidosis), sodium chloride, and ammonia, immediate-release topiramate was associated with changes in several clinical laboratory analytes in randomized, double-blind, placebo-controlled studies [see Warnings and Precautions (5.4, 5.13)]. Controlled trials of adjunctive topiramate treatment of adults for partial-onset seizures showed an increased incidence of markedly decreased serum phosphorus (6% topiramate versus 2% placebo), markedly increased serum alkaline phosphatase (3% topiramate versus 1% placebo), and decreased serum potassium (0.4% topiramate versus 0.1% placebo).

Pediatric Patients

In pediatric patients (1 to 24 months) receiving adjunctive topiramate for partial-onset seizures, there was an increased incidence for an increased result (relative to normal analyte reference range) associated with immediate-release topiramate (vs placebo) for the following clinical laboratory analytes: creatinine, BUN, alkaline phosphatase, and total protein. The incidence was also increased for a decreased result for bicarbonate (i.e., metabolic acidosis), and potassium with immediate-release topiramate (vs. placebo) [see Use in Specific Populations (8.4)]. Topiramate extended-release capsules are not indicated for partial-onset seizures in pediatric patients less than 6 years of age.

In pediatric patients (ranging from 6 years to 17 years of age) receiving immediate-release topiramate for the preventive treatment of migraine, there was an increased incidence for an increased result (relative to normal analyte reference range) associated with immediate-release topiramate (vs placebo) for the following clinical laboratory analytes: creatinine, BUN, uric acid, chloride, ammonia, alkaline phosphatase, total protein, platelets, and eosinophils. The incidence was also increased for a decreased result for phosphorus, bicarbonate, total white blood count, and neutrophils [see Use in Specific Populations (8.4)]. Topiramate extended-release capsules are not indicated for the preventive treatment of migraine in pediatric patients less than 12 years of age.

6.2 Postmarketing Experience
The following adverse reactions have been identified during post-approval use of immediate-release topiramate. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Body as a Whole-General Disorders : oligohydrosis and hyperthermia [see Warnings and Precautions (5.3)], hyperammonemia, hyperammonemic encephalopathy [see Warnings and Precautions (5.13)], hypothermia with concomitant valproic acid [see Warnings and Precautions (5.15)].

Gastrointestinal System Disorders : hepatic failure (including fatalities), hepatitis, pancreatitis

Skin and Appendage Disorders : bullous skin reactions (including erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis) [see Warnings and Precautions (5.12)], pemphigus

Urinary System Disorders : kidney stones, nephrocalcinosis [see Warnings and Precautions (5.14)]

Vision disorders : acute myopia, secondary angle closure glaucoma [see Warnings and Precautions (5.1)], maculopathy

Hematological Disorders : decrease of the International Normalized Ratio (INR) or prothrombin time when given concomitantly with vitamin K antagonist anticoagulant medications such as warfarin.

7 Drug Interactions

Oral contraceptives: Decreased contraceptive efficacy and increased breakthrough bleeding, especially at doses greater than 200 mg per day (7.5)

Monitor lithium levels if lithium is used with high-dose topiramate extended-release capsules (7.8)

7.1 Alcohol
Alcohol use is contraindicated within 6 hours prior to and 6 hours after topiramate extended-release capsules administration [see Contraindications (4) and Warnings and Precautions (5.5)].

7.2 Antiepileptic Drugs
Concomitant administration of phenytoin or carbamazepine with topiramate resulted in a clinically significant decrease in plasma concentrations of topiramate when compared to topiramate given alone. A dosage adjustment may be needed [see Dosage and Administration (2.1), Clinical Pharmacology (12.3)].

Concomitant administration of valproic acid and topiramate has been associated with hypothermia and hyperammonemia with and without encephalopathy. Examine blood ammonia levels in patients in whom the onset of hypothermia has been reported [see Warnings and Precautions (5.13, 5.15) and Clinical Pharmacology (12.3)].

7.3 Other Carbonic Anhydrase Inhibitors
Concomitant use of topiramate, a carbonic anhydrase inhibitor, with any other carbonic anhydrase inhibitor (e.g., zonisamide or acetazolamide) may increase the severity of metabolic acidosis and may also increase the risk of kidney stone formation. Patients should be monitored for the appearance or worsening of metabolic acidosis when topiramate extended-release capsules are given concomitantly with another carbonic anhydrase inhibitor [see Clinical Pharmacology (12.3)].

7.4 CNS Depressants
Concomitant administration of topiramate with other CNS depressant drugs or alcohol has not been evaluated in clinical studies. Because of the potential of topiramate to cause CNS depression, as well as other cognitive and/or neuropsychiatric adverse reactions, topiramate extended-release capsules should be used with extreme caution if used in combination with alcohol and other CNS depressants [see Contraindications (4) and Warnings and Precautions (5.7) ].

7.5 Oral Contraceptives
The possibility of decreased contraceptive efficacy and increased breakthrough bleeding may occur in patients taking combination oral contraceptive products with topiramate extended-release capsules. Patients taking estrogen-containing contraceptives should be asked to report any change in their bleeding patterns. Contraceptive efficacy can be decreased even in the absence of breakthrough bleeding [see Clinical Pharmacology (12.3)].

7.6 Hydrochlorothiazide (HCTZ)
Topiramate C_max and AUC increased when HCTZ was added to immediate-release topiramate. The clinical significance of this change is unknown. The addition of HCTZ to topiramate extended-release capsulesmay require a decrease in the topiramate extended-release capsules dose [see Clinical Pharmacology (12.3)].

7.7 Pioglitazone
A decrease in the exposure of pioglitazone and its active metabolites were noted with the concurrent use of pioglitazone and immediate-release topiramate in a clinical trial. The clinical relevance of these observations is unknown; however, when topiramate extended-release capsules are added to pioglitazone therapy or pioglitazone is added to topiramate therapy, careful attention should be given to the routine monitoring of patients for adequate control of their diabetic disease state [see Clinical Pharmacology (12.3)].

7.8 Lithium
An increase in systemic exposure of lithium following topiramate doses of up to 600 mg/day can occur. Lithium levels should be monitored when co-administered with high-dose topiramate extended-release capsules [see Clinical Pharmacology (12.3)].

7.9 Amitriptyline
Some patients may experience a large increase in amitriptyline concentration in the presence of topiramate extended-release capsulesand any adjustments in amitriptyline dose should be made according to the patients' clinical response and not on the basis of plasma levels [see Clinical Pharmacology (12.3)].

8 Use In Specific Populations

8.1 Pregnancy
Pregnancy Exposure Registry

There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to antiepileptic drugs (AEDs), such as topiramate extended-release capsules, during pregnancy. Patients should be encouraged to enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry if they become pregnant. This registry is collecting information about the safety of antiepileptic drugs during pregnancy. To enroll, patients can call the toll-free number 1-888-233-2334. Information about the North American Drug Pregnancy Registry can be found at http://www.aedpregnancyregistry.org/.

Risk Summary

Topiramate extended-release capsules can cause fetal harm when administered to a pregnant woman. Data from pregnancy registries indicate that infants exposed to topiramate in utero have increased risk for cleft lip and/or cleft palate (oral clefts) and for being small for gestational age (SGA) [see Human Data]. SGA has been observed at all doses and appears to be dose-dependent. The prevalence of SGA is greater in infants of women who received higher doses of topiramate during pregnancy. In addition, the prevalence of SGA in infants of women who continued topiramate use until later in pregnancy is higher compared to the prevalence in infants of women who stopped topiramate use before the third trimester.

In multiple animal species, topiramate demonstrated developmental toxicity, including increased incidences of fetal malformations, in the absence of maternal toxicity at clinically relevant doses [see Animal Data].

In the U.S. general population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies are 2% to 4% and 15% to 20%, respectively.

Clinical Considerations

Fetal/Neonatal Adverse Reactions

Consider the benefits and risks of topiramate when prescribing this drug to women of childbearing potential, particularly when topiramate is considered for a condition not usually associated with permanent injury or death. Because of the risk of oral clefts to the fetus, which occur in the first trimester of pregnancy before many women know they are pregnant, all women of childbearing potential should be informed of the potential risk to the fetus from exposure to topiramate. Women who are planning a pregnancy should be counseled regarding the relative risks and benefits of topiramate use during pregnancy, and alternative therapeutic options should be considered for these patients.

Labor or Delivery

Although the effect of topiramate on labor and delivery in humans has not been established, the development of topiramate-induced metabolic acidosis in the mother and/or in the fetus might affect the fetus' ability to tolerate labor.

Topiramate extended-release capsules treatment can cause metabolic acidosis [see Warnings and Precautions (5.4)]. The effect of topiramate-induced metabolic acidosis has not been studied in pregnancy; however, metabolic acidosis in pregnancy (due to other causes) can cause decreased fetal growth, decreased fetal oxygenation, and fetal death, and may affect the fetus' ability to tolerate labor. Pregnant patients should be monitored for metabolic acidosis and treated as in the nonpregnant state [see Warnings and Precautions (5.4)]. Newborns of mothers treated with topiramate extended-release capsules should be monitored for metabolic acidosis because of transfer of topiramate to the fetus and possible occurrence of transient metabolic acidosis following birth.

Based on limited information, topiramate has also been associated with pre-term labor and premature delivery.

Data

Human Data

Data from pregnancy registries indicate an increased risk of oral clefts in infants exposed to topiramate during the first trimester of pregnancy. In the NAAED pregnancy registry, the prevalence of oral clefts among topiramate-exposed infants (1.1%) was higher than the prevalence of infants exposed to reference AEDs (0.36%), or the prevalence in infants of mothers without epilepsy and without exposure to AEDs (0.12%). It was also higher than the background prevalence in United States (0.17%) as estimated by the Centers for Disease Control and Prevention (CDC). The relative risk of oral clefts in topiramate-exposed pregnancies in the NAAED Pregnancy Registry was 9.6 (95% Confidence Interval=[CI] 4.0 to 23.0) as compared to the risk in a background population of untreated women. The UK Epilepsy and Pregnancy Register reported a prevalence of oral clefts among infants exposed to topiramate monotherapy (3.2%) that was 16 times higher than the background rate in the UK (0.2%).

Data from the NAAED pregnancy registry and a population-based birth registry cohort indicate that exposure to topiramate in utero is associated with an increased risk of SGA newborns (birth weight <10th percentile). In the NAAED pregnancy registry, 19.7 % of topiramate-exposed newborns were SGA compared to 7.9 % of newborns exposed to a reference AED, and 5.4% of newborns of mothers without epilepsy and without AED exposure. In the Medical Birth Registry of Norway (MBRN), a population-based pregnancy registry, 25% of newborns in the topiramate monotherapy exposure group were SGA compared to 9 % in the comparison group who were unexposed to AEDs. The long-term consequences of the SGA findings are not known.

Animal Data

When topiramate (0, 20, 100, or 500 mg/kg/day) was administered orally to pregnant mice during the period of organogenesis, incidences of fetal malformations (primarily craniofacial defects) were increased at all doses. Fetal body weights and skeletal ossification were reduced at the highest dose tested in conjunction with decreased maternal body weight gain. A no-effect dose for embryofetal developmental toxicity in mice was not identified. The lowest dose tested, which was associated with an increased incidence of malformations, is less than the maximum recommended human dose (MRHD) for epilepsy (400 mg/day) or migraine (100 mg/day) on a body surface area (mg/m²) basis.

In pregnant rats administered topiramate (0, 20, 100, and 500 mg/kg/day or 0, 0.2, 2.5, 30, and 400 mg/kg/day) orally during the period of organogenesis, the frequency of limb malformations (ectrodactyly, micromelia, and amelia) was increased in fetuses at 400 and 500 mg/kg/day. Embryotoxicity (reduced fetal body weights, increased incidences of structural variations) was observed at doses as low as 20 mg/kg/day. Clinical signs of maternal toxicity were seen at 400 mg/kg/day and above, and maternal body weight gain was reduced at doses of 100 mg/kg/day or greater. The no-effect dose (2.5 mg/kg/day) for embryofetal developmental toxicity in rats is less than the MRHD for epilepsy or migraine on a mg/m² basis.

In pregnant rabbits administered topiramate (0, 20, 60, and 180 mg/kg/day or 0, 10, 35, and 120 mg/kg/day) orally during organogenesis, embryofetal mortality was increased at 35 mg/kg/day and an increased incidence of fetal malformations (primarily rib and vertebral malformations) was observed at 120 mg/kg/day. Evidence of maternal toxicity (decreased body weight gain, clinical signs, and/or mortality) was seen at 35 mg/kg/day and above. The no-effect dose (20 mg/kg/day) for embryofetal developmental toxicity in rabbits is equivalent to the MRHD for epilepsy and approximately 4 times the MRHD for migraine on a mg/m² basis.

When topiramate (0, 0.2, 4, 20, and 100 mg/kg/day or 0, 2, 20, and 200 mg/kg/day) was administered orally to female rats during the latter part of gestation and throughout lactation, offspring exhibited decreased viability and delayed physical development at 200 mg/kg/day and reductions in pre-and/or postweaning body weight gain at 2 mg/kg/day and above. Maternal toxicity (decreased body weight gain, clinical signs) was evident at 100 mg/kg/day or greater.

In a rat embryofetal development study which included postnatal assessment of offspring, oral administration of topiramate (0, 0.2, 2.5, 30, and 400 mg/kg/day) to pregnant animals during the period of organogenesis resulted in delayed physical development in offspring at 400 mg/kg/day and persistent reductions in body weight gain in offspring at 30 mg/kg/day and higher. The no-effect dose (0.2 mg/kg/day) for pre- and postnatal developmental toxicity is less than the MRHD for epilepsy or migraine on a mg/m² basis.

8.2 Lactation
Risk Summary

Topiramate is excreted in human milk [see Data]. The effects of topiramate exposure on milk production are unknown.

Diarrhea and somnolence have been reported in breastfed infants whose mothers receive topiramate treatment.

The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for topiramate extended-release capsules and any potential adverse effects on the breastfed infant from topiramate extended-release capsules or from the underlying maternal condition.

Data

Limited data from 5 women with epilepsy treated with topiramate during lactation showed drug levels in milk similar to those in maternal plasma.

8.3 Females and Males of Reproductive Potential
Contraception

Women of childbearing potential who are not planning a pregnancy should use effective contraception because of the risks to the fetus of oral clefts and of being small for gestational age [see Drug Interactions (7.5) and Use in Specific Populations (8.1)].

8.4 Pediatric Use
Seizures in Pediatric Patients 6 Years of Age and Older

The safety and effectiveness of topiramate extended-release capsules for treatment of partial onset seizures, primary generalized tonic-clonic seizures, or Lennox-Gastaut syndromes in pediatric patients at least 6 years of age is based on controlled trials with immediate-release topiramate [see Adverse Reactions (6.1), Clinical Studies (14.2, 14.3)].

The adverse reactions in pediatric patients treated for partial-onset seizure, primary generalized tonic-clonic seizures, or Lennox-Gastaut syndrome are similar to those seen in adults [see Warnings and Precautions (5) and Adverse Reactions (6)].

These include, but are not limited to:

oligohydrosis and hyperthermia [see Warnings and Precautions (5.3)].

dose-related increased incidence of metabolic acidosis [see Warnings and Precautions (5.4)].

dose-related increased incidence of hyperammonemia [see Warnings and Precautions (5.13)].

Not Recommended for Pediatric Patients Younger than 6 Years of Age

The safety and effectiveness of topiramate extended-release capsules for treatment of partial-onset seizures, primary generalized tonic-clonic seizures, or Lennox-Gastaut syndromes in pediatric patients younger than 6 years of age has not been established.

Because the capsule must be swallowed whole, and may not be sprinkled on food, crushed or chewed, topiramate extended-release capsules is recommended only for children age 6 or older.

The following pediatric use information for adjunctive treatment for partial-onset epilepsy in infants and toddlers (1 to 24 months) is based on studies conducted with immediate-release topiramate, which failed to demonstrate efficacy.

Safety and effectiveness of immediate-release topiramate in patients below the age of 2 years have not been established for the adjunctive therapy treatment of partial onset seizures, primary generalized tonic-clonic seizures, or seizures associated with Lennox-Gastaut syndrome. In a single randomized, double-blind, placebo-controlled investigational trial, the efficacy, safety, and tolerability of immediate-release topiramate oral liquid and sprinkle formulations as an adjunct to concurrent antiepileptic drug therapy in pediatric patients 1 to 24 months of age with refractory partial-onset seizures were assessed. After 20 days of double-blind treatment, immediate-release topiramate (at fixed doses of 5, 15, and 25 mg/kg per day) did not demonstrate efficacy compared with placebo in controlling seizures.

In general, the adverse reaction profile for immediate-release topiramate in this population was similar to that of older pediatric patients, although results from the above controlled study, and an open-label, long-term extension study in these pediatric patients 1 to 24 months old suggested some adverse reactions not previously observed in older pediatric patients and adults; i.e., growth/length retardation, certain clinical laboratory abnormalities, and other adverse reactions that occurred with a greater frequency and/or greater severity than had been recognized previously from studies in older pediatric patients or adults for various indications.

These very young pediatric patients appeared to experience an increased risk for infections (any topiramate dose 12%, placebo 0%) and of respiratory disorders (any topiramate dose 40%, placebo 16%). The following adverse reactions were observed in at least 3% of patients on immediate-release topiramate and were 3% to 7% more frequent than in patients on placebo: viral infection, bronchitis, pharyngitis, rhinitis, otitis media, upper respiratory infection, cough, and bronchospasm. A generally similar profile was observed in older pediatric patients [see Adverse Reactions (6.1)].

Immediate-release topiramate resulted in an increased incidence of patients with increased creatinine (any topiramate dose 5%, placebo 0%), BUN (any topiramate dose 3%, placebo 0%), and protein (any topiramate dose 34%, placebo 6%), and an increased incidence of decreased potassium (any topiramate dose 7%, placebo 0%). This increased frequency of abnormal values was not dose related. Creatinine was the only analyte showing a noteworthy increased incidence (topiramate 25 mg/kg/day 5%, placebo 0%) of a markedly abnormal increase [see Adverse Reactions (6.1 )]. The significance of these findings is uncertain.

Immediate-release topiramate treatment also produced a dose-related increase in the percentage of patients who had a shift from normal at baseline to high/increased (above the normal reference range) in total eosinophil count at the end of treatment. The incidence of these abnormal shifts was 6 % for placebo, 10% for 5 mg/kg/day, 9% for 15 mg/kg/day, 14% for 25 mg/kg/day, and 11% for any topiramate dose [see Adverse Reactions (6.1)]. There was a mean dose-related increase in alkaline phosphatase. The significance of these findings is uncertain.

Topiramate produced a dose-related increased incidence of hyperammonemia [see Warnings and Precautions (5.13)].

Treatment with immediate-release topiramate for up to 1 year was associated with reductions in Z SCORES for length, weight, and head circumference [see Warnings and Precautions (5.4) and Adverse Reactions (6)].

In open-label, uncontrolled experience, increasing impairment of adaptive behavior was documented in behavioral testing over time in this population. There was a suggestion that this effect was dose-related. However, because of the absence of an appropriate control group, it is not known if this decrement in function was treatment related or reflects the patient's underlying disease (e.g., patients who received higher doses may have more severe underlying disease) [see Warnings and Precautions (5.7)].

In this open-label, uncontrolled study, the mortality was 37 deaths/1000 patient years. It is not possible to know whether this mortality rate is related to immediate-release topiramate treatment, because the background mortality rate for a similar, significantly refractory, young pediatric population (1 month to 24 months) with partial epilepsy is not known.

Other Pediatric Studies

Topiramate treatment produced a dose-related increased shift in serum creatinine from normal at baseline to an increased value at the end of 4-months treatment in adolescent patients (ages 12 years to 16 years) in a double-blind, placebo-controlled study [see Adverse Reactions (6.1)].

A one-year, active-controlled, open-label study with blinded assessments of bone mineral density (BMD) and growth in pediatric patients 4 to 15 years of age, including 63 patients with recent or new onset of epilepsy, was conducted to assess effects of immediate-release topiramate (N=28, 6-15 years of age) versus levetiracetam (N=35, 4-15 years of age) monotherapy on bone mineralization and on height and weight, which reflect growth. Effects on bone mineralization were evaluated via dual-energy X-ray absorptiometry and blood markers. Table 8 summarizes effects of immediate-release topiramate at 12 months for key safety outcomes including BMD, height, height velocity, and weight. All Least Square Mean values for immediate-release topiramate and the comparator were positive. Therefore, the Least Square Mean treatment differences shown reflect an immediate-release topiramate-induced attenuation of the key safety outcomes. Statistically significant effects were observed for decreases in BMD (and bone mineral content) in lumbar spine and total body less head and in weight. Subgroup analyses according to age demonstrated similar negative effects for all key safety outcomes (i.e., BMD, height, weight).

Safety Parameter Treatment Difference in Least Square Means (95 % Confidence Interval)

Annual Change in BMD Lumbar Spine (g/cm²) -0.036 (-0.058, -0.014)

Annual Change in BMD TBLH* (g/cm²) -0.026 (-0.039, -0.012)

Annual Change in Height (cm) (4 years to 9 years, Primary Analysis Population for Height) ** -0.84 (-2.67, 0.99)

Annual Change in Height (cm) (4 years to 15 years) -0.75 (-2.21, 0.71)

Annual Change in Height (cm) (10 years to 15 years) -1.01 (-3.64, 1.61)

Height Velocity (cm/year) (4 years to 9 years) -1.00 (-2.76, 0.76)

Height Velocity (cm/year) (4 years to 15 years) -0.98 (-2.33, 0.37)

Height Velocity (cm/year) (10 years to 15 years) -0.96 (-3.24, 1.32)

Annual Change in Weight (kg) -2.05 (-3.66, -0.45)

Metabolic acidosis (serum bicarbonate <20 mEq/L) was observed in all immediate-release topiramate treated patients at some time in the study [see Warnings and Precautions (5.4)]. Over the whole study, 76% more immediate-release topiramate-treated patients experienced persistent metabolic acidosis (i.e., 2 consecutive visits with or final serum bicarbonate < 20 mEq/L) compared to levetiracetam-treated patients. Over the whole study, 35% more immediate-release topiramate-treated patients experienced a markedly abnormally low serum bicarbonate (i.e., absolute value <17 mEq/L and ≥ 5mEq/L decrease from pre-treatment), indicating the frequency of more severe metabolic acidosis, compared to levetiracetam-treated patients. The decrease in BMD at 12 months was correlated with decreased serum bicarbonate, suggesting that metabolic acidosis was at least a partial factor contributing to this adverse effect on BMD.

Immediate-release topiramate-treated patients exhibited an increased risk for developing an increased serum creatinine and an increased serum glucose above the normal reference range compared to control patients.

Preventive Treatment of Migraine in Pediatric Patients 12 Years to 17 Years of Age

Safety and effectiveness of topiramate for the preventive treatment of migraine was studied in 5 double-blind, randomized, placebo-controlled, parallel-group trials in a total of 219 pediatric patients, at doses of 50 mg/day to 200 mg/day or 2 mg/kg/day to 3 mg/kg/day. These comprised a fixed dose study in 103 pediatric patients 12 years to 17 years of age [see Clinical Studies (14.4)], a flexible dose (2 mg/kg/day to 3 mg/kg/day), placebo-controlled study in 157 pediatric patients 6 years to 16 years of age (including 67 pediatric patients 12 years to 16 years of age) and a total of 49 pediatric patients 12 years to 17 years of age in 3 studies for the preventive treatment of migraine primarily in adults. Open-label extension phases of 3 studies enabled evaluation of long-term safety for up to 6 months after the end of the double-blind phase.

Efficacy of topiramate for the preventive treatment of migraine in pediatric patients 12 years to 17 years of age is demonstrated for a 100 mg daily dose in Study 3 [see Clinical Studies (14.4)]. Efficacy of topiramate (2 mg/kg/day to 3 mg/kg/day) for the preventive treatment of migraine was not demonstrated in a placebo-controlled trial of 157 pediatric patients (6 years to 16 years of age) that included treatment of 67 pediatric patients (12 years to 16 years of age) for 20 weeks.

In the pediatric trials (12 years to 17 years of age) in which patients were randomized to placebo or a fixed daily dose of immediate-release topiramate, the most common adverse reactions with immediate-release topiramate that were seen at an incidence higher (≥ 5%) than in the placebo group were: paresthesia, upper respiratory tract infection, anorexia and abdominal pain [see Adverse Reactions (6.1)].

The most common cognitive adverse reaction in pooled double-blind studies in pediatric patients 12 years to 17 years of age was difficulty with concentration/attention [see Warnings and Precautions (5.7)].

Markedly abnormally low serum bicarbonate values indicative of metabolic acidosis were reported in topiramate-treated pediatric migraine patients [see Warnings and Precautions (5.4)].

In topiramate-treated pediatric patients (12 years to 17 years of age) compared to placebo-treated patients, abnormally increased results were more frequent for creatinine, BUN, uric acid, chloride, ammonia, total protein and platelets. Abnormally decreased results were observed with topiramate vs. placebo treatment for phosphorus and bicarbonate [see Adverse Reactions (6.1)]. Notable changes (increases and decreases) from baseline in systolic blood pressure, diastolic blood pressure and pulse that were observed occurred more commonly in pediatric patients treated with topiramate compared to pediatric patients treated with placebo [see Clinical Pharmacology (12.2)].

Preventive Treatment of Migraine in Pediatric Patients 6 Years to 11 Years of Age

Safety and effectiveness in pediatric patients below the age of 12 years have not been established for the preventive treatment of migraine.

In a double-blind study in 90 pediatric patients 6 years to 11 years of age (including 59 topiramate-treated and 31 placebo patients), the adverse reaction profile was generally similar to that seen in pooled double-blind studies of pediatric patients 12 years to 17 years of age. The most common adverse reactions that occurred in immediate-release topiramate-treated pediatric patients 6 years to 11 years of age and at least twice as frequently than placebo, were gastroenteritis (12% topiramate, 6% placebo), sinusitis (10% topiramate, 3% placebo), weight loss (8% topiramate, 3% placebo) and paresthesia (7% topiramate, 0% placebo). Difficulty with concentration/attention occurred in 3 topiramate-treated patients (5%) and 0 placebo-treated patients.

The risk for cognitive adverse reactions was greater in younger patients (6 years to 11 years of age) than in older patients (12 years to 17 years of age) [see Warnings and Precautions (5.7)].

Juvenile Animal Studies

When topiramate (30 mg/kg/day, 90 mg/kg/day and 300 mg/kg/day) was administered orally to rats during the juvenile period of development (postnatal days 12 to 50), bone growth plate thickness was reduced in males at the highest dose, which is approximately 5 times to 8 times the maximum recommended pediatric dose (9 mg/kg/day) on a body surface area (mg/m2) basis.

8.5 Geriatric Use
Clinical studies of immediate-release topiramate did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently than younger subjects. Dosage adjustment may be necessary for elderly with creatinine clearance less than 70 mL/min/1.73 m². Estimate GFR should be measured prior to dosing [see Dosage and Administration (2.5) and Clinical Pharmacology (12.3)].

8.6 Renal Impairment
The clearance of topiramate is reduced in patients with moderate (creatinine clearance 30 to 69 mL/min/1.73m²) and severe (creatinine clearance less than 30 mL/min/1.73 m²) renal impairment. A dosage adjustment is recommended in patients with moderate or severe renal impairment [see Dosage and Administration (2.5) and Clinical Pharmacology (12.3)].

8.7 Patients Undergoing Hemodialysis
Topiramate is cleared by hemodialysis at a rate that is 4 to 6 times greater than in a normal individual. A dosage adjustment may be required [see Dosage and Administration (2.6) and Clinical Pharmacology (12.3)].

10 Overdosage

Overdoses of topiramate have been reported. Signs and symptoms included convulsions, drowsiness, speech disturbance, blurred vision, diplopia, impaired mentation, lethargy, abnormal coordination, stupor, hypotension, abdominal pain, agitation, dizziness and depression. The clinical consequences were not severe in most cases, but deaths have been reported after overdoses involving topiramate.

Topiramate overdose has resulted in severe metabolic acidosis [see Warnings and Precautions (5.4)].

A patient who ingested a dose of immediate-release topiramate between 96 g and 110 g was admitted to a hospital with a coma lasting 20 to 24 hours followed by full recovery after 3 to 4 days.

Similar signs, symptoms, and clinical consequences are expected to occur with overdosage of topiramate extended-release capsules. In the event of overdose, topiramate extended-release capsules should be discontinued and general supportive treatment given until clinical toxicity has been diminished or resolved. Hemodialysis is an effective means of removing topiramate from the body.

11 Description

Topiramate, is a sulfamate-substituted monosaccharide. Topiramate extended-release capsules are available as 25 mg, 50 mg and 100 mg capsules for oral administration.

Topiramate, USP is a white to off-white crystalline powder. Topiramate is freely soluble in dichloromethane.

Topiramate has the molecular formula C₁₂H₂₁NO₈S and a molecular weight of 339.4. Topiramate is designated chemically as 2,3:4,5-Di-O-isopropylidene-β-D-fructopyranose sulfamate and has the following structural formula:
Topiramate extended-release capsules contain 25 mg, 50 mg, 100 mg or 200 mg of

topiramate and contains following inactive ingredients: ethyl cellulose, hypromellose,

microcrystalline cellulose, polyethylene glycol, talc and triethyl citrate.

Additionally, each 25 mg, 50 mg and 100 mg capsule contain hydrogenated castor oil

and povidone and each 200 mg capsule contains hydroxypropyl cellulose.

The capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide and water.

The capsule is imprinted with black pharmaceutical ink and contains following

inactive ingredients: black iron oxide, potassium hydroxide and shellac.

12 Clinical Pharmacology

12.1 Mechanism of Action
The precise mechanisms by which topiramate exerts its anticonvulsant and preventive migraine effects are unknown; however, preclinical studies have revealed four properties that may contribute to topiramate's efficacy for epilepsy and the preventive treatment of migraine. Electrophysiological and biochemical evidence suggests that topiramate, at pharmacologically relevant concentrations, blocks voltage-dependent sodium channels, augments the activity of the neurotransmitter gamma-aminobutyrate at some subtypes of the GABA-A receptor, antagonizes the AMPA/kainate subtype of the glutamate receptor, and inhibits the carbonic anhydrase enzyme, particularly isozymes II and IV.

12.2 Pharmacodynamics
Topiramate has anticonvulsant activity in rat and mouse maximal electroshock seizure (MES) tests. Topiramate is only weakly effective in blocking clonic seizures induced by the GABA-A receptor antagonist, pentylenetetrazole. Topiramate is also effective in rodent models of epilepsy, which include tonic and absence- like seizures in the spontaneous epileptic rat (SER) and tonic and clonic seizures induced in rats by kindling of the amygdala or by global ischemia.

Changes (increases and decreases) from baseline in vital signs (systolic blood pressure-SBP, diastolic blood pressure-DBP, pulse) occurred more frequently in pediatric patients (6 to 17 years) treated with various daily doses of topiramate (50 mg, 100 mg, 200 mg, 2 to 3 mg/kg) than in patients treated with placebo in controlled trials for the preventive treatment of migraine. The most notable changes were SBP < 90 mm Hg, DBP < 50 mm Hg, SBP or DBP increases or decreases ≥ 20 mm Hg, and pulse increases or decreases ≥ 30 beats per minute. These changes were often dose-related, and were most frequently associated with the greatest treatment difference at the 200 mg dose level. Systematic collection of orthostatic vital signs has not been conducted. The clinical significance of these various changes in vital signs has not been clearly established.

12.3 Pharmacokinetics
Absorption and Distribution

Linear pharmacokinetics of topiramate from topiramate extended-release capsules were observed following a single oral dose over the range of 50 mg to 200 mg. At 25 mg, the pharmacokinetics of topiramate extended-release capsules is nonlinear possibly due to the binding of topiramate to carbonic anhydrase in red blood cells.

The peak plasma concentrations (C_max) of topiramate occurred at approximately 24 hours following a single 200 mg oral dose of topiramate extended-release capsules. At steady-state, the (AUC_0-24, C_max, and C_min) of topiramate from topiramate extended-release capsules administered once-daily and the immediate-release tablet administered twice-daily were shown to be bioequivalent. Fluctuation of topiramate plasma concentrations at steady-state for topiramate extended-release capsules administered once-daily was approximately 26% and 42% in healthy subjects and in epileptic patients, respectively, compared to approximately 40% and 51%, respectively, for immediate-release topiramate [see Clinical Pharmacology (12.6)].

Compared to the fasted state, high-fat meal increased the C_max of topiramate by 37% and shortened the T_max to approximately 8 hours following a single dose of topiramate extended-release capsules, while having no effect on the AUC. Modeling of the observed single dose fed data with simulation to steady state showed that the effect on C_max is significantly reduced following repeat administrations. Topiramate extended-release capsules can be taken without regard to meals.

Topiramate is 15% to 41% bound to human plasma proteins over the blood concentration range of 0.5 mcg/mL to 250 mcg/mL. The fraction bound decreased as blood concentration increased.

Carbamazepine and phenytoin do not alter the binding of immediate-release topiramate. Sodium valproate, at 500 mcg/mL (a concentration 5 to 10 times higher than considered therapeutic for valproate) decreased the protein binding of immediate-release topiramate from 23% to 13%. Immediate-release topiramate does not influence the binding of sodium valproate.

Metabolism and Excretion

Topiramate is not extensively metabolized and is primarily eliminated unchanged in the urine (approximately 70% of an administered dose). Six metabolites have been identified in humans, none of which constitutes more than 5% of an administered dose. The metabolites are formed via hydroxylation, hydrolysis, and glucuronidation. There is evidence of renal tubular reabsorption of topiramate. In rats, given probenecid to inhibit tubular reabsorption, along with topiramate, a significant increase in renal clearance of topiramate was observed. This interaction has not been evaluated in humans. Overall, oral plasma clearance (CL/F) is approximately 20 mL/min to 30 mL/min in adults following oral administration. The mean elimination half-life of topiramate was approximately 31 hours following repeat administration of topiramate extended-release capsules.

Specific Populations

Renal Impairment

The clearance of topiramate was reduced by 42% in subjects with moderate renal impairment (creatinine clearance 30 to 69 mL/min/1.73m²) and by 54% in subjects with severe renal impairment (creatinine clearance less than 30 mL/min/1.73m²) compared to subjects with normal renal function (creatinine clearance greater than 70 mL/min/1.73m²) [see Dosage and Administration (2.5)].

Hemodialysis

Topiramate is cleared by hemodialysis. Using a high-efficiency, counterflow, single pass-dialysate hemodialysis procedure, topiramate dialysis clearance was 120 mL/min with blood flow through the dialyzer at 400 mL/min. This high clearance (compared to 20 mL/min to 30 mL/min total oral clearance in healthy adults) will remove a clinically significant amount of topiramate from the patient over the hemodialysis treatment period [see Dosage and Administration (2.6) and Use in Specific Populations (8.7)].

Hepatic Impairment

Plasma clearance of topiramate decreased a mean of 26% in patients with moderate to severe hepatic impairment.

Age, Gender and Race

The pharmacokinetics of topiramate in elderly subjects (65 to 85 years of age, N=16) were evaluated in a controlled clinical study. The elderly subject population had reduced renal function (creatinine clearance [- 20%]) compared to young adults. Following a single oral 100 mg dose, maximum plasma concentration for elderly and young adults was achieved at approximately 1 to 2 hours. Reflecting the primary renal elimination of topiramate, topiramate plasma and renal clearance were reduced 21% and 19%, respectively, in elderly subjects, compared to young adults. Similarly, topiramate half-life was longer (13%) in the elderly. Reduced topiramate clearance resulted in slightly higher maximum plasma concentration (23%) and AUC (25%) in elderly subjects than observed in young adults. Topiramate clearance is decreased in the elderly only to the extent that renal function is reduced [see Dosage and Administration (2.4) and Use in Specific Populations (8.5)].

In a study of 13 healthy elderly subjects and 18 healthy young adults who received topiramate extended-release capsules, 30% higher mean C_max and 44% higher AUC values were observed in elderly compared to young subjects. Elderly subjects exhibited shorter median T_max at 16 hours versus 24 hours in young subjects. The apparent elimination half-life was similar across age groups. As recommended for all patients, dosage adjustment is indicated in elderly patients with a creatinine clearance rate less than 70 mL/min/1.73 m²) [see Dosage and Administration (2.5) and Use in Specific Populations (8.5)].

Clearance of topiramate in adults was not affected by gender or race.

Pediatric Pharmacokinetics

Pharmacokinetics of immediate-release topiramate were evaluated in patients ages 2 to < 16 years of age. Patients received either no or a combination of other antiepileptic drugs. A population pharmacokinetic model was developed on the basis of pharmacokinetic data from relevant topiramate clinical studies. This dataset contained data from 1217 subjects including 258 pediatric patients age 2 years to < 16 years of age (95 pediatric patients less than 10 years of age). Pediatric patients on adjunctive treatment exhibited a higher oral clearance (L/h) of topiramate compared to patients on monotherapy, presumably because of increased clearance from concomitant enzyme-inducing antiepileptic drugs. In comparison, topiramate clearance per kg is greater in pediatric patients than in adults and in young pediatric patients (down to 2 years of age) than in older pediatric patients. Consequently, the plasma drug concentration for the same mg/kg/day dose would be lower in pediatric patients compared to adults and also in younger pediatric patients compared to older pediatric patients.

Clearance was independent of dose.

As in adults, hepatic enzyme-inducing antiepileptic drugs decrease the steady state plasma concentrations of topiramate.

Drug-Drug Interaction Studies

In vitro studies indicate that topiramate does not inhibit CYP1A2, CYP2A6, CYP2B6, CYP2C9, CYP2D6, CYP2E1, and CYP3A4/5 isozymes. In vitro studies indicate that immediate-release topiramate is a mild inhibitor of CYP2C19 and a mild inducer of CYP3A4. The same drug interactions can be expected with the use of topiramate extended-release capsules.

Antiepileptic Drugs

Potential interactions between immediate-release topiramate and standard AEDs were assessed in controlled clinical pharmacokinetic studies in patients with epilepsy. The effects of these interactions on mean plasma AUCs are summarized in Table 9. Interaction of topiramate extended-release capsules and standard AEDs is not expected to differ from the experience with immediate-release topiramate products.

In Table 9, the second column (AED concentration) describes what happens to the concentration of the coadministered AED uled in the first column when topiramate is added. The third column (topiramate concentration) describes how the coadministration of a drug uled in the first column modifies the concentration of topiramate when compared to topiramate given alone.

Table 9 Summary of AED Interactions with Topiramate
* =Plasma concentration increased 25% in some patients, generally those on a twice a day dosing regimen of phenytoin

† =Is not administered but is an active metabolite of carbamazepine

NC=Less than 10% change in plasma concentration

AED=Antiepileptic drug

NE=Not evaluated

TPM=topiramate

AED Coadministered AED Concentration Topiramate Concentration

Phenytoin NC or 25% increase* 48% decrease

Carbamazepine (CBZ) NC 40% decrease

CBZ epoxide^† NC NE

Valproic acid 11% decrease 14% decrease

Phenobarbital NC NE

Primidone NC NE

Lamotrigine NC at TPM doses up to 400 mg per day 13% decrease

Oral Contraceptives

In a pharmacokinetic interaction study in healthy volunteers with a concomitantly administered combination oral contraceptive product containing 1 mg norethindrone (NET) plus 35 mcg ethinyl estradiol (EE), immediate-release topiramate, given in the absence of other medications at doses of 50 to 200 mg/day, was not associated with statistically significant changes in mean exposure (AUC) to either component of the oral contraceptive. In another study, exposure to EE was statistically significantly decreased at doses of 200, 400, and 800 mg per day (18%, 21%, and 30%, respectively) when given as adjunctive therapy in patients taking valproic acid. In both studies, topiramate (50 mg per day to 800 mg per day) did not significantly affect exposure to NET, and there was no significant dose-dependent change in EE exposure for doses of 50 to 200 mg/day. The clinical significance of the changes observed is not known [see Drug Interactions (7.5)].

Digoxin

In a single-dose study, serum digoxin AUC was decreased by 12% with concomitant topiramate administration. The clinical relevance of this observation has not been established.

Hydrochlorothiazide

A drug interaction study conducted in healthy volunteers evaluated the steady-state pharmacokinetics of hydrochlorothiazide (HCTZ) (25 mg every 24 hours) and topiramate (96 mg every 12 hours) when administered alone and concomitantly. The results of this study indicate that topiramate C_maxincreased by 27% and AUC increased by 29% when HCTZ was added to topiramate. The clinical significance of this change is unknown. The steady-state pharmacokinetics of HCTZ were not significantly influenced by the concomitant administration of topiramate. Clinical laboratory results indicated decreases in serum potassium after topiramate or HCTZ administration, which were greater when HCTZ and topiramate were administered in combination [see Drug Interactions (7.6)].

Metformin

A drug interaction study conducted in healthy volunteers evaluated the steady-state pharmacokinetics of metformin (500 mg every 12 hours) and topiramate in plasma when metformin was given alone and when metformin and topiramate (100 mg every 12 hours) were given simultaneously. The results of this study indicated that the mean metformin C_max and AUC_0-12h increased by 17% and 25%, respectively, when topiramate was added. Topiramate did not affect metformin T_max. The clinical significance of the effect of topiramate on metformin pharmacokinetics is not known. Oral plasma clearance of topiramate appears to be reduced when administered with metformin. The clinical significance of the effect of metformin on topiramate or topiramate extended-release capsules pharmacokinetics is unclear.

Pioglitazone

A drug interaction study conducted in healthy volunteers evaluated the steady-state pharmacokinetics of topiramate and pioglitazone when administered alone and concomitantly. A 15% decrease in the AUC_τ,ss of pioglitazone with no alteration in C_max,ss was observed. This finding was not statistically significant. In addition, a 13% and 16% decrease in C_max,ssand AUC_τ,ss respectively, of the active hydroxy-metabolite was noted as well as a 60% decrease in C_max,ss and AUC_τ,ss of the active keto-metabolite. The clinical significance of these findings is not known [see Drug Interactions (7.7)].

Glyburide

A drug interaction study conducted in patients with type 2 diabetes evaluated the steady-state pharmacokinetics of glyburide (5 mg per day) alone and concomitantly with topiramate (150 mg per day). There was a 22% decrease in C_max and 25% reduction in AUC₂₄ for glyburide during topiramate administration. Systemic exposure (AUC) of the active metabolites, 4-trans-hydroxy glyburide (M1) and 3-cis hydroxyglyburide (M2), was also reduced by 13% and 15%, reduced C_max by 18% and 25%, respectively. The steady-state pharmacokinetics of topiramate were unaffected by concomitant administration of glyburide.

Lithium

In patients, the pharmacokinetics of lithium were unaffected during treatment with topiramate at doses of 200 mg per day; however, there was an observed increase in systemic exposure of lithium (27% for C_max and 26% for AUC) following topiramate doses up to 600 mg per day. [see Drug Interactions (7.8)].

Haloperidol

The pharmacokinetics of a single dose of haloperidol (5 mg) were not affected following multiple dosing of topiramate (100 mg every 12 hr) in 13 healthy adults (6 males, 7 females).

Amitriptyline

There was a 12% increase in AUC and C_max for amitriptyline (25 mg per day) in 18 healthy subjects (9 males, 9 females) receiving 200 mg per day of immediate-release topiramate [see Drug Interactions (7.9)].

Sumatriptan

Multiple dosing of topiramate (100 mg every 12 hours) in 24 healthy volunteers (14 males, 10 females) did not affect the pharmacokinetics of single-dose sumatriptan either orally (100 mg) or subcutaneously (6 mg).

Risperidone

When administered concomitantly with topiramate at escalating doses of 100, 250, and 400 mg per day, there was a reduction in risperidone systemic exposure (16% and 33% for steady-state AUC at the 250 and 400 mg per day doses of topiramate). No alterations of 9-hydroxyrisperidone levels were observed. Coadministration of topiramate 400 mg per day with risperidone resulted in a 14% increase in C_max and a 12% increase in AUC₁₂ of topiramate. There were no clinically significant changes in the systemic exposure of risperidone plus 9- hydroxyrisperidone or of topiramate; therefore, this interaction is not likely to be of clinical significance.

Propranolol

Multiple dosing of topiramate (200 mg per day) in 34 healthy volunteers (17 males, 17 females) did not affect the pharmacokinetics of propranolol following daily 160 mg doses. Propranolol doses of 160 mg per day in 39 volunteers (27 males, 12 females) had no effect on the exposure to topiramate at a dose of 200 mg/day of topiramate.

Dihydroergotamine

Multiple dosing of topiramate (200 mg/day) in 24 healthy volunteers (12 males, 12 females) did not affect the pharmacokinetics of a 1 mg subcutaneous dose of dihydroergotamine. Similarly, a 1 mg subcutaneous dose of dihydroergotamine did not affect the pharmacokinetics of a 200 mg/ day dose of topiramate in the same study.

Diltiazem

Coadministration of diltiazem (240 mg Cardizem CD^®) with topiramate (150 mg/day) resulted in a 10% decrease in C_max and 25% decrease in diltiazem AUC, 27% decrease in C_max and 18% decrease in des-acetyl diltiazem AUC, and no effect on N-desmethyl diltiazem. Coadministration of topiramate with diltiazem resulted in a 16% increase in C_max and a 19% increase in AUC₁₂ of topiramate.

Venlafaxine

Multiple dosing of topiramate (150 mg/day) in healthy volunteers did not affect the pharmacokinetics of venlafaxine or O-desmethyl venlafaxine. Multiple dosing of venlafaxine (150 mg) did not affect the pharmacokinetics of topiramate.

12.6 Relative Bioavailability of Topiramate Extended-Release capsules Compared to Immediate-Release Topiramate
Study in Healthy Normal Volunteers

Topiramate extended-release capsule taken once a day provides steady state plasma levels comparable to immediate-release topiramate taken every 12 hours, when administered at the same total 200-mg daily dose. In a crossover study, 33 healthy subjects were titrated to a 200-mg dose of either topiramate extended-release capsules or immediate-release topiramate and were maintained at 200 mg per day for 10 days.

The 90% CI for the ratios of AUC_0-24, C_max and C_min, as well as partial AUC (the area under the concentration- time curve from time 0 to time p (post dose) for multiple time points were within the 80 to 125% bioequivalence limits, indicating no clinically significant difference between the two formulations. In addition, the 90% CI for the ratios of topiramate plasma concentration at each of multiple time points over 24 hours for the two formulations were within the 80 to 125% bioequivalence limits, except for the initial time points before 1.5 hour post-dose.

Study in Patients with Epilepsy

In a study in epilepsy patients treated with immediate-release topiramate alone or in combination with either enzyme-inducing or neutral AEDs who were switched to an equivalent daily dose of topiramate extended-release capsules, there was a 10% decrease in AUC_0-24, C_max, and C_min on the first day after the switch in all patients. At steady state, AUC_0-24and C_max were comparable to immediate-release topiramate in all patients. While patients treated with topiramate extended-release capsules alone or in combination with neutral AEDs showed comparable C_min at steady state, patients treated with enzyme-inducers showed a 10% decrease in C_min. This difference is likely not clinically significant and probably due to the small number of patients on enzyme-inducers.

13 Nonclinical Toxicology

13.1 Carcinogenesis, Mutagenesis, and Impairment of Fertility
Carcinogenesis

An increase in urinary bladder tumors was observed in mice given topiramate (0, 20, 75, and 300 mg/kg/day) in the diet for 21 months. An increase in the incidence of bladder tumors in males and females receiving 300 mg/kg was primarily due to the increased occurrence of a smooth muscle tumor considered histomorphologically unique to mice. The higher of the doses not associated with an increase in tumors (75 mg/kg/day) is equivalent to the maximum recommended human dose (MRHD) for epilepsy and approximately 4 times the MRHD for migraine (100 mg) on a mg/m² basis. The relevance of this finding to human carcinogenic risk is uncertain.

No evidence of carcinogenicity was seen in rats following oral administration of topiramate for 2 years at doses up to 120 mg/kg/day (approximately 3 times the MRHD for epilepsy and 12 times the MRHD for migraine on a mg/m² basis).

Mutagenesis

Topiramate did not demonstrate genotoxic potential when tested in a battery of in vitro and in vivo assays. Topiramate was not mutagenic in the Ames test or the in vitro mouse lymphoma assay; it did not increase unscheduled DNA synthesis in rat hepatocytes in vitro; and it did not increase chromosomal aberrations in human lymphocytes in vitro or in rat bone marrow in vivo.

Impairment of Fertility

No adverse effects on male or female fertility were observed in rats administered oral doses of up to 100 mg/kg/day (2.5 times the MRHD for epilepsy and 10 times the MRHD for migraine on a mg/m² basis) prior to and during mating and early pregnancy.

14 Clinical Studies

14.1 Bridging Study to Demonstrate Pharmacokinetic Equivalence between Extended-Release and Immediate-Release Topiramate Formulations
The basis for approval of the extended-release formulation (topiramate extended-release capsules) included the studies described below using an immediate-release formulation and the demonstration of the pharmacokinetic equivalence of topiramate extended-release capsules to immediate-release topiramate through the analysis of concentrations and cumulative AUCs at multiple time points [see Clinical Pharmacology (12.6)].

The clinical studies described in the following sections were conducted using immediate-release topiramate.

14.2 Monotherapy Epilepsy
Patients With Partial-Onset or Primary Generalized Tonic-Clonic Seizures

Adults and Pediatric Patients 10 Years of Age and Older

The effectiveness of topiramate as initial monotherapy in adults and pediatric patients 10 years of age and older with partial-onset or primary generalized tonic-clonic seizures was established in a multicenter, randomized, double-blind, dose-controlled, parallel-group trial (Study 1).

Study 1 was conducted in 487 patients diagnosed with epilepsy (6 to 83 years of age) who had 1 or 2 well-documented seizures during the 3-month retrospective baseline phase who then entered the study and received topiramate 25 mg per day for 7 days in an open-label fashion. Forty-nine percent of subjects had no prior AED treatment and 17% had a diagnosis of epilepsy for greater than 24 months. Any AED therapy used for temporary or emergency purposes was discontinued prior to randomization. In the double-blind phase, 470 patients were randomized to titrate up to 50 mg/day or 400 mg/day of topiramate. If the target dose could not be achieved, patients were maintained on the maximum tolerated dose. Fifty-eight percent of patients achieved the maximal dose of 400 mg/day for ˃ 2 weeks, and patients who did not tolerate 150 mg/day were discontinued.

The primary efficacy assessment was a between-group comparison of time to first seizure during the double- blind phase. Comparison of the Kaplan-Meier survival curves of time to first seizure favored the topiramate 400 mg /day group over the topiramate 50 mg /day group (Figure 1). The treatment effects with respect to time to first seizure were consistent across various patient subgroups defined by age, sex, geographic region, baseline body weight, baseline seizure type, time since diagnosis, and baseline AED use.

Figure 1

Kaplan-Meier Estimates of Cumulative Rates for Time to First Seizure in Study 1
Pediatric Patients 6 to 9 Years of Age

The conclusion that topiramate is effective as initial monotherapy in pediatric patients 6 to 9 years of age with partial-onset or primary generalized tonic-clonic seizures was based on a pharmacometric bridging approach using data from the controlled epilepsy trials conducted with immediate-release topiramate described in labeling. The approach consisted of first showing a similar exposure response relationship between pediatric patients down to 2 years of age and adults when immediate-release topiramate was given as adjunctive therapy [see Use in Specific Populations (8.4)]. Similarity of exposure-response was demonstrated in pediatric patients 6 to less than16 years of age and adults when topiramate was given as initial monotherapy. Specific dosing in pediatric patients 6 to 9 years of age was derived from simulations utilizing plasma exposure ranges observed in pediatric and adult patients treated with immediate-release topiramate initial monotherapy [see Dosage and Administration (2.1)].

14.3 Adjunctive Therapy Epilepsy
Adult Patients With Partial-Onset Seizures

The effectiveness of topiramate as an adjunctive treatment for adults with partial-onset seizures was established in six multicenter, randomized, double-blind, placebo-controlled trials (Studies 2, 3, 4, 5, 6 and 7), two comparing several dosages of topiramate and placebo and four comparing a single dosage with placebo, in patients with a history of partial onset seizures, with or without secondarily generalized seizures.

Patients in these studies were permitted a maximum of two antiepileptic drugs (AEDs) in addition to topiramate tablets or placebo. In each study, patients were stabilized on optimum dosages of their concomitant AEDs during baseline phase lasting between 4 weeks and 12 weeks. Patients who experienced a pre-specified minimum number of partial-onset seizures, with or without secondary generalization, during the baseline phase (12 seizures for 12 week baseline, 8 for 8 week baseline or 3 for 4 week baseline) were randomly assigned to placebo or a specified dose of topiramate tablets in addition to their other AEDs.

Following randomization, patients began the double-blind phase of treatment. In five of the six studies, patients received active drug beginning at 100 mg per day; the dose was then increased by 100 mg/day or 200 mg/day increments weekly or every other week until the assigned dose was reached, unless intolerance prevented increases. In Study 7, the 25 mg/day or 50 mg/day initial doses of topiramate were followed by respective weekly increments of 25 mg/day or 50 mg/day until the target dose of 200 mg/day was reached. After titration, patients entered a 4 week, 8 week or 12 week stabilization period. The numbers of patients randomized to each dose and the actual mean and median doses in the stabilization period are shown in Table 10.

Pediatric Patients 6 Years to 16 Years of Age With Partial-Onset Seizures

The effectiveness of topiramate as an adjunctive treatment for pediatric patients 6 years to 16 years of age with partial-onset seizures was established in a multicenter, randomized, double-blind, placebo-controlled trial (Study 8), comparing topiramate and placebo in patients with a history of partial-onset seizures, with or without secondarily generalized seizures.

Patients in Study 8 were permitted a maximum of two antiepileptic drugs (AEDs) in addition to topiramate tablets or placebo. In Study 8, patients were stabilized on optimum dosages of their concomitant AEDs during an 8 week baseline phase. Patients who experienced at least six partial onset seizures, with or without secondarily generalized seizures, during the baseline phase were randomly assigned to placebo or topiramate in addition to their other AEDs.

Following randomization, patients began the double-blind phase of treatment. Patients received active drug beginning at 25 mg/day or 50 mg/day; the dose was then increased by 25 mg/day to 150 mg/day increments every other week until the assigned dosage of 125 mg/day, 175 mg/day, 225 mg/day or 400 mg/day based on patients' weight to approximate a dosage of 6 mg/kg/day per day was reached, unless intolerance prevented increases. After titration, patients entered an 8 week stabilization period.

Patients With Primary Generalized Tonic-Clonic Seizures

The effectiveness of topiramate as an adjunctive treatment for primary generalized tonic-clonic seizures in patients 6 years of age and older was established in a multicenter, randomized, double-blind, placebo-controlled trial (Study 9), comparing a single dosage of topiramate and placebo (see Table 11).

Patients in Study 9 were permitted a maximum of two antiepileptic drugs (AEDs) in addition to topiramate or placebo. Patients were stabilized on optimum dosages of their concomitant AEDs during an 8 week baseline phase. Patients who experienced at least three primary generalized tonic-clonic seizures during the baseline phase were randomly assigned to placebo or topiramate in addition to their other AEDs.

Following randomization, patients began the double-blind phase of treatment. Patients received active drug beginning at 50 mg/day for four weeks; the dose was then increased by 50 mg/day to 150 mg/day increments every other week until the assigned dose of 175 mg/day, 225 mg/day or 400 mg/day based on patients' body weight to approximate a dosage of 6 mg/kg/day was reached, unless intolerance prevented increases. After titration, patients entered a 12 week stabilization period.

Patients With Lennox-Gastaut Syndrome

The effectiveness of topiramate as an adjunctive treatment for seizures associated with Lennox-Gastaut syndrome in patients 6 years of age and older was established in a multicenter, randomized, double-blind, placebo-controlled trial (Study 10), comparing a single dosage of topiramate with placebo (see Table 11).

Patients in Study 10 were permitted a maximum of two antiepileptic drugs (AEDs) in addition to topiramate or placebo. Patients who were experiencing at least 60 seizures per month before study entry were stabilized on optimum dosages of their concomitant AEDs during a 4 week baseline phase. Following baseline, patients were randomly assigned to placebo or topiramate in addition to their other AEDs. Active drug was titrated beginning at 1 mg/kg/day for a week; the dose was then increased to 3 mg/kg/day for one week then to 6 mg/kg/day. After titration, patients entered an 8 week stabilization period. The primary measures of effectiveness were the percent reduction in drop attacks and a parental global rating of seizure severity.

Table 10 Immediate Release Topiramate Dose Summary During the Stabilization Periods of Each of Six Double-Blind, Placebo-Controlled, Adjunctive Trials in Adults with Partial-Onset Seizures*
* Dose-response studies were not conducted for other indications or pediatric partial-onset seizures.

^† Placebo dosages are given as the number of tablets. Placebo target dosages were as follows: Study 4 (4 tablets/day); Studies 2 and 5 (6 tablets/day); Studies 6 and 7 (8 tablets/day); Study 3 (10 tablets/day).

Target Topiramate Dosage (mg per day)

Study Stabilization Dose Placebo^† 200 400 600 800 1,000

2 N 42 42 40 41 - -

Mean Dose 5.9 200 390 556 - -

Median Dose 6 200 400 600 - -

3 N 44 - - 40 45 40

Mean Dose 9.7 - - 544 739 796

Median Dose 10 - - 600 800 1,000

4 N 23 - 19 - - -

Mean Dose 3.8 - 395 - - -

Median Dose 4 - 400 - - -

5 N 30 - - 28 - -

Mean Dose 5.7 - - 522 - -

Median Dose 6 - - 600 - -

6 N 28 - - - 25 -

Mean Dose 8 - - - 568 -

Median Dose 8 - - - 600 -

7 N 90 157 - - - -

Mean Dose 8 200 - - - -

Median Dose 8 200 - - - -

In all adjunctive topiramate trials, the reduction in seizure rate from baseline during the entire double-blind phase was measured. The median percent reductions in seizure rates and the responder rates (fraction of patients with at least a 50% reduction) by treatment group for each study are shown below in Table 11. As described above, a global improvement in seizure severity was also assessed in the Lennox-Gastaut trial.

Table 11 Efficacy Results in Double-Blind, Placebo-Controlled, Adjunctive Epilepsy Trials
Comparisons with placebo:

* For Studies 8 and 9, specified target dosages (<9.3 mg/kg/day) were assigned based on subject's weight to approximate a dosage of 6mg/kg per day; these dosages corresponded to mg/day dosages of 125, 175, 225, and 400 mg/day

^†p=0.080;

^‡p ≤ 0.010;

^§p ≤ 0.001;

^¶p ≤ 0.050;

^#p=0.065;

^Þp ≤ 0.005;

^ß Studies included pediatric patients 2 years of age and older, an age group for which topiramate extended-release capsules are not indicated [see Indications and Usage (1.2) and Use in Specific Populations (8.4)]

^àMedian % reduction and % responders are reported for PGTC seizures;

^èMedian % reduction and % responders for drop attacks, i.e., tonic or atonic seizures

p=0.071;

ØPercentage of subjects who were minimally, much, or very much improved from baseline.

Target Topiramate Dosage (mg per day)

Study # # Placebo 200 400 600 800 1,000 ≈6mg/kg/day*

Partial Onset Seizures Studies in Adults

2 N 45 45 45 46 - - -

Median % Reduction 12 27^† 48^‡ 45^§ - - -

% Responders 18 24 44^¶ 46^¶ - - -

3 N 47 - - 48 48 47 -

Median % Reduction 2 - - 41^§ 41^§ 36^§

% Responders 9 - - 40^§ 41^§ 36^¶

4 N 24 - 23 - - - -

Median % Reduction 1 - 41^# - - - -

% Responders 8 - 35^¶ - - - -

5 N 30 - - 30 - - -

Median % Reduction -12 - - 46^Þ - - -

% Responders 10 - - 47^§ - - -

6 N 28 - - - 28 - -

Median % Reduction -21 - - - 24^§ - -

% Responders 0 - - - 43^§ - -

7 N 91 168 - - - - -

Median % Reduction 20 44^§ - - - - -

% Responders 24 45^§

Partial Onset Seizures Studies in Pediatric Patients^ß

8 N 45 - - - - - 41

Median % Reduction 11 - - - - - 33^¶

% Responders 20 - - - - - 39

Primary Generalized Tonic-Clonic^{à, ß}

9 N 40 - - - - - 39

Median % Reduction 9 - - - - - 57^¶

% Responders 20 - - - - - 56^§

Lennox-Gastaut Syndrome^{è, ß}

10 N 49 - - - - - 46

Median % Reduction -5 - - - - - 15^¶

% Responders 14 28

Improvement in Seizure SeverityØ 28 52^¶

Subset analyses of the antiepileptic efficacy of topiramate tablets in these studies showed no differences as a function of gender, race, age, baseline seizure rate, or concomitant AED.

In clinical trials for epilepsy, daily dosages were decreased in weekly intervals by 50 mg per day to 100 mg per day in adults and over a 2- to 8-week period in pediatric patients; transition was permitted to a new antiepileptic regimen when clinically indicated.

14.4
Adult Patients

The results of 2 multicenter, randomized, double-blind, placebo-controlled, parallel-group clinical trials conducted in US (Study 11) or the US and Canada (Study 12) established the effectiveness of immediate-release topiramate in the preventive treatment of migraine. The design of both trials was identical, enrolling patients with a history of migraine with or without aura, for at least 6 months, according to the International Headache Society (IHS) diagnostic criteria. Patients with a history of cluster headaches or basilar, opthalmoplegic, hemiplegic, or transformed migraine headaches were excluded from the trials. Patients were required to have completed up to a 2-week washout of any prior migraine preventative medications before starting the baseline phase.

Patients who experienced 3 to 12 migraine headaches over the 4 weeks in the baseline phase were randomized to either immediate-release topiramate 50 mg/day, 100 mg/day, 200 mg/day (twice the recommended daily dosage for migraine prophylaxis) or placebo, and treated for a total of 26 weeks (8-week titration period and 18-week maintenance period.). Treatment was initiated at 25 mg/day for one week, and then the daily dosage was increased by 25 mg increments each week until reaching the assigned target dose or maximum tolerated dose (administered twice daily).

Effectiveness of treatment was assessed by the reduction in migraine headache frequency, as measured by the change in 4-week migraine rate (according to migraines classified by IHS criteria) from the baseline phase to double-blind treatment period in each immediate-release topiramate treatment group compared to placebo in the Intent-To-Treat (ITT) population.

In Study 11, a total of 469 patients (416 females, 53 males) ranging in age from 13 to 70 years, were randomized and provided efficacy data. Two hundred sixty-five patients completed the entire 26-week double-blind phase. The median average daily dosages were 48 mg/day, 88 mg/ day, and 132 mg/day in the target dose groups of topiramate 50, 100 and 200 mg/day, respectively.

The mean migraine headache frequency rate at baseline was approximately 5.5 migraine headaches per 28 days and was similar across treatment groups. The change in the mean 4-week migraine headache frequency from baseline to the double-blind phase was -1.3, -2.1, and -2.2 in the immediate-release topiramate 50, 100, and 200 mg/day groups, respectively, versus -0.8 in the placebo group (see Figure 2). The treatment differences between the immediate release topiramate 100 and 200 mg/day groups versus placebo were similar and statistically significant (p = 0.008 and p < 0.001, respectively).

In Study 12, a total of 468 patients (406 females, 62 males) ranging in age from 12 to 65 years, were randomized and provided efficacy data. Two hundred fifty-five patients completed the entire 26-week double-blind phase. The median average daily dosages were 47 mg/day, 86 mg/day, and 150 mg/day in the target dose groups of immediate-release topiramate 50, 100, and 200 mg/day, respectively.

The mean migraine headache frequency rate at baseline was approximately 5.5 migraine headaches per 28 days and was similar across treatment groups. The change in the mean 4-week migraine headache period frequency from baseline to the double-blind phase was -1.4, -2.1, and -2.4 in the immediate-release topiramate 50, 100, and 200 mg/day groups, respectively, versus -1.1 in the placebo group (see Figure 2). The differences between the immediate-release topiramate 100 and 200 mg per day groups versus placebo were similar and statistically significant (p equals 0.008 and p less than 0.001, respectively).

In both studies there were no apparent differences in treatment effect within age or gender subgroups. Because most patients were Caucasian, there were insufficient numbers of patients from different races to make a meaningful comparison of race.

For patients withdrawing from immediate-release topiramate, daily dosages were decreased in weekly intervals by 25 to 50 mg/day.

Figure 2

Reduction in 4-Week Migraine Headache Frequency (Studies 11 and 12 for Adults and Adolescents)
Pediatric Patients 12 to 17 Years of Age

The effectiveness of immediate-release topiramate for the preventive treatment of migraine in pediatric patients 12 years to 17 years of age was established in a multicenter, randomized, double-blind, parallel-group trial (Study 13). The study enrolled 103 patients (40 male, 63 female) 12 years to 17 years of age with episodic migraine headaches with or without aura. Patient selection was based on IHS criteria for migraines (using proposed revisions to the 1988 IHS pediatric migraine criteria [IHS-R criteria]).

Patients who experienced 3 to 12 migraine attacks (according to migraines classified by patient reported diaries) and ≤ 14 headache days (migraine and non-migraine) during the 4 week prospective baseline period were randomized to either immediate-release topiramate 50 mg/day, 100 mg/day or placebo and treated for a total of 16 weeks (4 week titration period followed by a 12 week maintenance period). Treatment was initiated at 25 mg/day for one week and then the daily dosage was increased by 25 mg increments each week until reaching the assigned target dose or maximum tolerated dose (administered twice daily). Approximately 80% or more patients in each treatment group completed the study. The median average daily dosages were 45 mg/day and 79 mg/day in the target dose groups of immediate-release topiramate 50 mg/day and 100 mg/day, respectively.

Effectiveness of treatment was assessed by comparing each immediate-release topiramate treatment group to placebo (ITT population) for the percent reduction from baseline to the last 12 weeks of the double-blind phase in the monthly migraine attack rate (primary endpoint). The percent reduction from baseline to the last 12 weeks of the double-blind phase in average monthly migraine attack rate is shown in Table 12. The 100 mg immediate-release topiramate dose produced a statistically significant treatment difference relative to placebo of 28% reduction from baseline in the monthly migraine attack rate.

The mean reduction from baseline to the last 12 weeks of the double-blind phase in average monthly attack rate, a key secondary efficacy endpoint in Study 13 (and the primary efficacy endpoint in Studies 11 and 12, of adults) was 3 for 100 mg immediate-release topiramate dose and 1.7 for placebo. This 1.3 treatment difference in mean reduction from baseline of monthly migraine rate was statistically significant (p=0.0087).

Table 12 Percent Reduction from Baseline to the Last 12 Weeks of Double-Blind Phase in Average Monthly Attack Rate: Study 13 (Intent-to-Treat Analysis Set)
^*P-values (two-sided) for comparisons relative to placebo are generated by applying an ANCOVA model on ranks that includes subject's stratified age at baseline, treatment group, and analysis center as factors and monthly migraine attack rate during baseline period as a covariate.

^†P-values for the dose groups are the adjusted p-value according to the Hochberg multiple comparison procedure.

^‡Indicates p-value is < 0.05 (two-sided).

Category Placebo (N=33) Immediate-Release Topiramate 50 mg/day (N=35) Immediate-Release Topiramate 100 mg/day (N=35)

Baseline

Median 3.6 4.0 4.0

Last 12 Weeks of Double-Blind Phase

Median 2.3 2.3 1.0

Percent Reduction (%)

Median 44.4 44.6 72.2

P-value versus Placebo^*,† 0.7975 0.0164^‡

16 How Supplied/storage And Handling

16.1 How Supplied
Topiramate Extended-Release Capsules

Topiramate Extended-Release Capsules are available in the following strengths:

25 mg capsules: Off white pellets filled in size '2' hard gelatin capsules with white opaque cap printed with '863' in black ink and a white opaque body and are supplied as follows:

NDC 68382-863-06 in bottle of 30 capsules with child-resistant closure

NDC 68382-863-16 in bottle of 90 capsules with child-resistant closure

NDC 68382-863-01 in bottle of 100 capsules with child-resistant closure

NDC 68382-863-05 in bottle of 500 capsules

NDC 68382-863-77 in cartons of 100 (10 x 10) unit-dose capsules

50 mg capsules: Off white pellets filled in size '0' hard gelatin capsules with white opaque cap printed with '864' in black ink and a white opaque body and are supplied as follows:

NDC 68382-864-06 in bottle of 30 capsules with child-resistant closure

NDC 68382-864-16 in bottle of 90 capsules with child-resistant closure

NDC 68382-864-01 in bottle of 100 capsules with child-resistant closure

NDC 68382-864-05 in bottle of 500 capsules

NDC 68382-864-77 in cartons of 100 (10 x 10) unit-dose capsules

100 mg capsules: Off white pellets filled in size '0el' hard gelatin capsules with white opaque cap printed with '769' in black ink and a white opaque body and are supplied as follows:

NDC 68382-769-06 in bottle of 30 capsules with child-resistant closure

NDC 68382-769-16 in bottle of 90 capsules with child-resistant closure

NDC 68382-769-01 in bottle of 100 capsules with child-resistant closure

NDC 68382-769-05 in bottle of 500 capsules

NDC 68382-769-77 in cartons of 100 (10 x 10) unit-dose capsules

200 mg capsules: White to off-white pellets filled in size '00' hard gelatin capsules with white opaque cap printed with '358' in black ink and a white opaque body and are supplied as follows:

NDC 68382-358-06 in bottle of 30 capsules with child-resistant closure

NDC 68382-358-01 in bottle of 100 capsules with child-resistant closure

NDC 68382-358-05 in bottle of 500 capsules

NDC 68382-358-78 in cartons of 30 capsules (3 x 10 unit-dose) (Unit-dose bulers are child-resistant)

16.2 Storage and Handling
Topiramate extended-release capsules should be stored in well-closed containers at 20° to 25°C (68° to 77°F); excursions permitted between 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature].

Protect from moisture and light.

17 Patient Counseling Information

Advise the patient to read the FDA-approved patient labeling (Medication Guide).

Administration Instructions

Counsel patients to swallow topiramate extended-release capsules whole and intact. Topiramate extended-release capsules should not be sprinkled on food, chewed or crushed [see Dosage and Administration (2.7)].

Consumption of Alcohol

Advise patients to completely avoid consumption of alcohol at least 6 hours prior to and 6 hours after taking topiramate extended-release capsules [see Warnings and Precautions (5.5)].

Eye Disorders

Advise patients taking topiramate extended-release capsules to seek immediate medical attention if they experience blurred vision, visual disturbances or periorbital pain [see Warnings and Precautions (5.1, 5.2)].

Oligohydrosis and Hyperthermia

Counsel patients that topiramate extended-release capsules, especially pediatric patients, can cause decreased sweating and increased body temperature, especially in hot weather, and they should seek medical attention if this is noticed [see Warnings and Precautions (5.3)].

Metabolic Acidosis

Inform patients about the potentially significant risk for metabolic acidosis that may be asymptomatic and may be associated with adverse effects on kidneys (e.g., kidney stones, nephrocalcinosis), bones (e.g., osteoporosis, osteomalacia, and/or rickets in children), and growth (e.g., growth delay/retardation) in pediatric patients, and on the fetus [see Warnings and Precautions (5.4)].

Suicidal Behavior and Ideation

Counsel patients, their caregivers, and families that AEDs, including topiramate extended-release capsules, may increase the risk of suicidal thoughts and behavior and they should be advised of the need to be alert for the emergence or worsening of the signs and symptoms of depression, any unusual changes in mood or behavior or the emergence of suicidal thoughts, behavior or thoughts about self-harm. Behaviors of concern should be reported immediately to healthcare providers [see Warnings and Precautions (5.6)].

Interference With Cognitive and Motor Performance

Warn patients about the potential for somnolence, dizziness, confusion, difficulty concentrating, or visual effects and advise them not to drive or operate machinery until they have gained sufficient experience on topiramate extended-release capsules to gauge whether it adversely affects their mental performance, motor performance, and/or vision [see Warnings and Precautions (5.7)].

Advise patients that even when taking topiramate extended-release capsules or other anticonvulsants, some patients with epilepsy will continue to have unpredictable seizures. Therefore, counsel all patients taking topiramate extended-release capsules for epilepsy to exercise appropriate caution when engaging in any activities where loss of consciousness could result in serious danger to themselves or those around them (including swimming, driving a car, climbing in high places, etc.). Some patients with refractory epilepsy will need to avoid such activities altogether. Physicians should discuss the appropriate level of caution with their patients, before patients with epilepsy engage in such activities.

Fetal Toxicity

Counsel pregnant women and women of childbearing potential that use of topiramate extended-release capsules during pregnancy can cause fetal harm, including an increased risk for cleft lip and/or cleft palate (oral clefts), which occur early in pregnancy before many women know they are pregnant. Also inform patients that infants exposed to topiramate monotherapy in utero may be small for their gestational age [see Use in Specific Populations (8.1)]. There may also be risks to the fetus from chronic metabolic acidosis with use of topiramate extended-release capsules during pregnancy [see Warnings and Precautions (5.4, 5.8)].When appropriate, prescribers should counsel pregnant women and women of childbearing potential about alternative therapeutic options.

Advise women of childbearing potential who are not planning a pregnancy to use effective contraception while using topiramate, keeping in mind that there is a potential for decreased contraceptive efficacy when using estrogen-containing birth control with topiramate [see Warnings and Precautions (5.8) and Drug Interactions (7.5)].

Encourage pregnant women using topiramate extended-release capsules to enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry. The registry is collecting information about the safety of antiepileptic drugs during pregnancy [see Use in Specific Populations (8.1)].

Decrease in Bone Mineral Density

Inform the patient or caregiver that long-term treatment with topiramate extended-release capsules can decrease bone formation and increase bone resorption in children [see Warnings and Precautions (5.10)].

Negative Effects on Growth (Height and Weight)

Discuss with the patient or caregiver that long-term topiramate extended-release capsules treatment may attenuate growth as reflected by slower height increase and weight gain in pediatric patients [see Warnings and Precautions (5.11)].

Serious Skin Reactions

Inform patients about the signs of serious skin reactions. Instruct patients to immediately inform their healthcare provider at the first appearance of skin rash [see Warnings and Precautions (5.12)].

Hyperammonemia and Encephalopathy

Warn patients about the possible development of hyperammonemia with or without encephalopathy. Although hyperammonemia may be asymptomatic, clinical symptoms of hyperammonemic encephalopathy often include acute alterations in level of consciousness and/or cognitive function with lethargy or vomiting. This hyperammonemia and encephalopathy can develop with topiramate treatment alone or with topiramate treatment with concomitant valproic acid (VPA). Patients should be instructed to contact their physician if they develop unexplained lethargy, vomiting, or changes in mental status [see Warnings and Precautions (5.13)].

Kidney Stones

Instruct patients, particularly those with predisposing factors, to maintain an adequate fluid intake in order to minimize the risk of kidney stone formation [see Warnings and Precautions (5.14 )].

Hypothermia

Counsel patients that topiramate extended-release capsules can cause a reduction in body temperature, which can lead to alterations in mental status. If they note such changes, they should call their health care professional and measure their body temperature. Patients taking concomitant valproic acid should be specifically counseled on this potential adverse reaction [see Warnings and Precautions (5.15)].

Medication Guide available at www.zydususa.com/medguides or call 1-877-993-8779.

Spl Unclassified

Manufactured by:

Zydus Lifesciences Ltd.

Ahmedabad, India.

Distributed by:

Zydus Pharmaceuticals (USA) Inc.

Pennington, NJ 08534

Rev.: 04/23

Spl Medguide

MEDICATION GUIDE Topiramate (toe pir' a mate) Extended-Release Capsules

What is the most important information I should know about topiramate extended-release capsules? Take topiramate extended-release capsules whole. Do not sprinkle topiramate extended-release capsules on food or break, crush, dissolve or chew topiramate extended-release capsules before swallowing. If you cannot swallow topiramate extended-release capsules whole, tell your healthcare provider. You may need a different medicine. Do not drink alcohol within 6 hours prior to and 6 hours after topiramate extended-release capsules administration. Topiramate extended-release capsules may cause eye problems. Serious eye problems include:           any sudden decrease in vision with or without eye pain and redness,           a blockage of fluid in the eye causing increased pressure in the eye (secondary angle closure glaucoma).           These eye problems can lead to permanent loss of vision if not treated.           You should call your healthcare provider right away if you have any new eye symptoms, including any new problems with your vision. Topiramate extended-release capsules may cause decreased sweating and increased body temperature (fever). People, especially children, should be watched for signs of decreased sweating and fever, especially in hot temperatures. Some people may need to be hospitalized for this condition. If a high fever, a fever that does not go away or decreased sweating develops, call your healthcare provider right away. Topiramate extended-release capsules can increase the level of acid in your blood (metabolic acidosis). If left untreated, metabolic acidosis can cause brittle or soft bones (osteoporosis, osteomalacia, osteopenia), kidney stones, can slow the rate of growth in children and may possibly harm your baby if you are pregnant. Metabolic acidosis can happen with or without symptoms. Sometimes people with metabolic acidosis will:           feel tired           not feel hungry (loss of appetite)           feel changes in heartbeat           have trouble thinking clearly Your healthcare provider should do a blood test to measure the level of acid in your blood before and during your treatment with topiramate extended-release capsules. If you are pregnant, you should talk to your healthcare provider about whether you have metabolic acidosis. Like other antiepileptic drugs, topiramate extended-release capsules may cause suicidal thoughts or actions in a very small number of people, about 1 in 500. Call a healthcare provider right away if you have any of these symptoms, especially if they are new, worse or worry you:

          thoughts about suicide or dying           trouble sleeping (insomnia)

          attempts to commit suicide           new or worse irritability

          new or worse depression           acting aggressive, being angry or violent

          new or worse anxiety           acting on dangerous impulse

          feeling agitated or restless           an extreme increase in activity and talking (mania)

          panic attacks           other unusual changes in behavior or mood

Do not stop topiramate extended-release capsules without first talking to a healthcare provider.           Stopping topiramate extended-release capsules suddenly can cause serious problems.           Suicidal thoughts or actions can be caused by things other than medicines. If you have suicidal thoughts or actions, your healthcare provider may check for other causes. How can I watch for early symptoms of suicidal thoughts and actions?           Pay attention to any changes, especially sudden changes, in mood, behaviors, thoughts or feelings.           Keep all follow-up visits with your healthcare provider as scheduled.           Call your healthcare provider between visits as needed, especially if you are worried about symptoms. Topiramate extended-release capsules can harm your unborn baby.           If you take topiramate extended-release capsules during pregnancy, your baby has a higher risk for birth defects called cleft lip and cleft palate. These defects can begin early in pregnancy, even before you know you are pregnant.           Cleft lip and cleft palate may happen even in children born to women who are not taking any medicines and do not have other risk factors.           There may be other medicines to treat your condition that have a lower chance of birth defects.           All women of childbearing age should talk to their healthcare providers about using other possible treatments instead of topiramate extended-release capsules. If the decision is made to use topiramate extended-release capsules, you should use effective birth control (contraception) unless you are planning to become pregnant. You should talk to your doctor about the best kind of birth control to use while you are taking topiramate extended-release capsules.           Tell your healthcare provider right away if you become pregnant while taking topiramate extended-release capsules. You and your healthcare provider should decide if you will continue to take topiramate extended-release capsules while you are pregnant.           If you take topiramate extended-release capsules during pregnancy, your baby may be smaller than expected at birth. The long-term effects of this are not known. Talk to your healthcare provider if you have questions about this risk during pregnancy.           Metabolic acidosis may have harmful effects on your baby. Talk to your healthcare provider if topiramate extended-release capsules have caused metabolic acidosis during your pregnancy.           Pregnancy Registry: If you become pregnant while taking topiramate extended-release capsules, talk to your healthcare provider about registering with the North American Antiepileptic Drug Pregnancy Registry. You can enroll in this registry by calling 1-888-233-2334. The purpose of this registry is to collect information about the safety of topiramate extended-release capsules and other antiepileptic drugs during pregnancy. Topiramate extended-release capsules may decrease the density of bones when used over a long period. Topiramate extended-release capsules may slow height increase and weight gain in children and adolescents when used over a long period.

What are topiramate extended-release capsules? Topiramate extended-release capsules are a prescription medicine used:           to treat certain types of seizures (partial onset seizures and primary generalized tonic-clonic seizures) in people 6 years and older,           with other medicines to treat certain types of seizures (partial onset seizures, primary generalized tonic-clonic seizures and seizures associated with Lennox-Gastaut syndrome) in adults and children 6 years and older           to prevent migraine headaches in adults and adolescents 12 years of age and older. Before taking topiramate extended-release capsules, tell your healthcare provider about all of your medical conditions, including if you:           have or have had depression, mood problems or suicidal thoughts or behavior           have kidney problems, kidney stones or are getting kidney dialysis           have a history of metabolic acidosis (too much acid in the blood)           have liver problems           have weak, brittle or soft bones (osteomalacia, osteoporosis, osteopenia or decreased bone density)           have lung or breathing problems           have eye problems, especially glaucoma           have diarrhea           have a growth problem           are on a diet high in fat and low in carbohydrates, which is called a ketogenic diet           are having surgery           are pregnant or plan to become pregnant           are breastfeeding. Topiramate passes into your breast milk. Breastfed babies may be sleepy or have diarrhea. It is not known if the topiramate that passes into breast milk can cause other serious harm to your baby. Talk to your healthcare provider about the best way to feed your baby if you take topiramate extended-release capsules. Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins and herbal supplements. Especially, tell your healthcare provider if you take:           Valproic acid (such as DEPAKENE or DEPAKOTE)           any medicines that impair or decrease your thinking, concentration or muscle coordination           birth control pills. Topiramate extended-release capsules may make your birth control pills less effective. Tell your healthcare provider if your menstrual bleeding changes while you are taking birth control pills and topiramate extended-release capsules. Ask your healthcare provider if you are not sure if your medicine is uled above. Know the medicines you take. Keep a ul of them to show your healthcare provider and pharmacist each time you get a new medicine. Do not start a new medicine without talking with your healthcare provider.

How should I take topiramate extended-release capsules?           Take topiramate extended-release capsules exactly as prescribed.           Your healthcare provider may change your dose. Do not change your dose without talking to your healthcare provider.           Take topiramate extended-release capsules whole. Do not sprinkle topiramate extended-release capsules on food or break, crush, dissolve or chew topiramate extended-release capsules before swallowing.           Topiramate extended-release capsules can be taken before, during or after a meal. Drink plenty of fluids during the day. This may help prevent kidney stones while taking topiramate extended-release capsules.           If you take too much topiramate extended-release capsules, call your healthcare provider right away or go to the nearest emergency room.           Talk to your health care provider on what you should do if you miss a dose.           Do not stop taking topiramate extended-release capsules without talking to your healthcare provider. Stopping topiramate extended-release capsules suddenly may cause serious problems. If you have epilepsy and you stop taking topiramate extended-release capsules suddenly, you may have seizures that do not stop. Your healthcare provider will tell you how to stop taking topiramate extended-release capsules slowly.           Your healthcare provider may do blood tests while you take topiramate extended-release capsules.

What should I avoid while taking topiramate extended-release capsules?           Do not drink alcohol within 6 hours before or 6 hours after taking topiramate extended-release capsules. Topiramate extended-release capsules and alcohol can cause serious side effects such as severe sleepiness and dizziness and an increase in seizures.           Do not drive a car or operate heavy machinery until you know how topiramate extended-release capsules affect you. Topiramate extended-release capsules can slow your thinking and motor skills and may affect vision.

What are the possible side effects of topiramate extended-release capsules? Topiramate extended-release capsules may cause serious side effects, including: See "What is the most important information I should know about topiramate extended-release capsules?"           Serious skin reactions. Topiramate extended-release capsules may cause a severe rash with bulers and peeling skin, especially around the mouth, nose, eyes and genitals (Stevens-Johnson syndrome). Topiramate extended-release capsules may also cause a rash with bulers and peeling skin over much of the body that may cause death (toxic epidermal necrolysis). Call your healthcare provider right away if you develop a skin rash or bulers.           High blood ammonia levels. High ammonia in the blood can affect your mental activities, slow your alertness, make you feel tired or cause vomiting. This has happened when topiramate extended-release capsules are taken with a medicine called valproic acid (DEPAKENE and DEPAKOTE).           Kidney stones. Drink plenty of fluids when taking topiramate extended-release capsules to decrease your chances of getting kidney stones.           Low body temperature. Taking topiramate extended-release capsules when you are also taking valproic acid cause a drop in body temperature to less than 95ºF, feeling tired, confusion or coma.           Effects on thinking and alertness. Topiramate extended-release capsules may affect how you think and cause confusion, problems with concentration, attention, memory or speech. Topiramate extended-release capsules may cause depression or mood problems, tiredness and sleepiness.           Dizziness or loss of muscle coordination. Call your healthcare provider right away if you have any of the symptoms above. The most common side effects of topiramate extended-release capsules include:

          tingling of the arms and legs (paresthesia)           nervousness           fever

          not feeling hungry           speech problems           tiredness

          nausea           dizziness           sleepiness/drowsiness

          weight loss           slow reactions           difficulty with memory

          abnormal vision           upper respiratory tract infection           diarrhea

          a change in the way foods taste           pain in abdomen

          decreased feeling or sensitivity, especially in the skin

Tell your healthcare provider about any side effect that bothers you or that does not go away. These are not all the possible side effects of topiramate extended-release capsules. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

How should I store topiramate extended-release capsules?

Store topiramate extended-release capsules at room temperature between 20° to 25°C (68° to 77°F).

Topiramate extended-release capsules 25 mg, 50 mg and 100 mg come in child-resistant

bottle pack of 30's, 90's and 100's and 200 mg come in child-resistant bottle pack of 30's

and 100's and buler pack of 30's.

Keep topiramate extended-release capsules and all medicines out of the reach of children.

Keep topiramate extended-release capsules in a tightly closed container.

Keep topiramate extended-release capsules dry and away from moisture and light.

General information about the safe and effective use of topiramate extended-release capsules. Medicines are sometimes prescribed for purposes other than those uled in a Medication Guide. Do not use topiramate extended-release capsules for a condition for which it was not prescribed. Do not give topiramate extended-release capsules to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about topiramate extended-release capsules that is written for health professionals.

What are the ingredients in topiramate extended-release capsules? Active ingredient: topiramate, USP Inactive ingredients: ethyl cellulose, hypromellose, microcrystalline cellulose, polyethylene glycol, talc and triethyl citrate. Additionally, each 25 mg, 50 mg and 100 mg capsule contain hydrogenated castor oil and povidone and each 200 mg capsule contains hydroxypropyl cellulose. The capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide and water. The capsule is imprinted with black pharmaceutical ink and contains following inactive ingredients: black iron oxide, potassium hydroxide and shellac. For more information, go to MedicalAffairs@zydususa.com or Tel.: 1-877-993-8779. The brands uled are registered trademark of their respective owners. Medication Guide available at www.zydususa.com/medguides or call 1-877-993-8779.

Manufactured by: Zydus Lifesciences Ltd. Ahmedabad, India Distributed by: Zydus Pharmaceuticals (USA) Inc. Pennington, NJ 08534

Rev.: 04/23

This Medication Guide has been approved by the U.S. Food and Drug Administration.

Package Label.principal Display Panel

NDC 68382-863-06

Topiramate extended-release capsules, 25 mg

Rx only

30 capsules

Zydus
NDC 68382-864-06

Topiramate extended-release capsules, 50 mg

Rx only

30 capsules

Zydus
NDC 68382-769-06

Topiramate extended-release capsules, 100 mg

Rx only

30 capsules

Zydus
NDC 68382-358-06

Topiramate extended-release capsules, 200 mg

Rx only

30 capsules

Zydus

Table 2 Risk by Indication for Antiepileptic Drugs in the Pooled Analysis
Indication	Placebo Patients with Events per 1,000 Patients	Drug Patients with Events per 1,000 Patients	Relative Risk: Incidence of Events in Drug Patients/ Incidence in Placebo Patients	Risk Difference: Additional Drug Patients with Events per 1,000 Patients
Epilepsy	1	3.4	3.5	2.4
Psychiatric	5.7	8.5	1.5	2.9
Other	1	1.8	1.9	0.9
Total	2.4	4.3	1.8	1.9

Table 3 Adverse Reactions in the High Dose Group as Compared to the Low Dose Group, in Monotherapy Epilepsy Trial in Adult and Pediatric Patients
Body System/ Adverse Reaction	Age Group
Pediatric (6 to 15 Years)	Adult (Age ≥16 Years)
Immediate-release Topiramate Daily Dosage Group (mg/day)
50	400	50	400
(N=74) %	(N=77) %	(N=160) %	(N=159) %
Body as a Whole-General Disorders
Asthenia	0	3	4	6
Fever	1	12
Leg pain			2	3
Central & Peripheral Nervous System Disorders
Paresthesia	3	12	21	40
Dizziness			13	14
Ataxia			3	4
Hypoesthesia			4	5
Hypertonia			0	3
Involuntary Muscle contraction	0	3
Vertigo	0	3
Gastro-Intestinal System Disorders
Constipation			1	4
Diarrhea	8	9
Gastritis			0	3
Dry mouth			1	3
Liver and Biliary System Disorders
Increase in Gamma-GT			1	3
Metabolic and Nutritional Disorders
Weight loss	7	17	6	17
Platelet, Bleeding & Clotting Disorders
Epistaxis	0	4
Psychiatric Disorders
Anorexia			4	14
Anxiety			4	6
Cognitive problems	1	6	1	4
Confusion	0	3
Depression	0	3	7	9
Difficulty with concentration or attention	7	10	7	8
Difficulty with memory	1	3	6	11
Insomnia			8	9
Decrease in libido			0	3
Mood problems	1	8	2	5
Personality disorder (behavior problems)	0	3
Psychomotor slowing			3	5
Somnolence			10	15
Red Blood Cell Disorders
Anemia	1	3
Reproductive Disorders, Female
Intermenstrual bleeding	0	3
Vaginal hemorrhage			0	3
Resistance Mechanism Disorders
Infection	3	8	2	3
Viral infection	3	6	6	8
Respiratory System Disorders
Bronchitis	1	5	3	4
Upper respiratory tract infection	16	18
Rhinitis	5	6	2	4
Sinusitis	1	4
Skin and Appendages Disorders
Alopecia	1	4	3	4
Pruritus			1	4
Rash	3	4	1	4
Acne			2	3
Special Senses Other, Disorders
Taste perversion			3	5
Urinary System Disorders
Cystitis			1	3
Micturition frequency	0	3	0	2
Renal calculus			0	3
Urinary incontinence	1	3
Vascular (Extracardiac) Disorders
Flushing	0	5

Table 4 Most Common Adverse Reactions in Pooled Placebo-Controlled, Adjunctive Epilepsy Trials in Adults^{*, †}
*^ Patients in these adjunctive trials were receiving 1 to 2 concomitant antiepileptic drugs in addition to topiramate or placebo**
^† Values represent the percentage of patients reporting a given reaction. Patient may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category.
Body System/ Adverse Reaction	Placebo (N = 291) %	Topiramate Dosage (mg per day) 200 to 400 (N = 183) %
Body as a Whole-General Disorders
Fatigue	13	15
Asthenia	1	6
Back pain	4	5
Chest pain	3	4
Influenza-like symptoms	2	3
Central & Peripheral Nervous System Disorders
Dizziness	15	25
Ataxia	7	16
Speech disorders/Related speech problems	2	13
Paresthesia	4	11
Nystagmus	7	10
Tremor	6	9
Language problems	1	6
Coordination abnormal	2	4
Gait abnormal	1	3
Gastro-Intestinal System Disorders
Nausea	8	10
Dyspepsia	6	7
Abdominal pain	4	6
Constipation	2	4
Metabolic and Nutritional Disorders
Weight loss	3	9
Psychiatric Disorders
Somnolence	12	29
Nervousness	6	16
Psychomotor slowing	2	13
Difficulty with memory	3	12
Confusion	5	11
Anorexia	4	10
Difficulty with concentration/attention	2	6
Mood problems	2	4
Agitation	2	3
Aggressive reaction	2	3
Emotional liability	1	3
Cognitive problems	1	3
Reproductive Disorders, Female
Breast pain	2	4
Respiratory System Disorders
Pharyngitis	2	6
Rhinitis	6	7
Sinusitis	4	5
Vision Disorders
Vision abnormal	2	13
Diplopia	5	10

Table 5 Adverse Reactions in Pooled Placebo-Controlled, Adjunctive Epilepsy Trial in Pediatric Patients 2 to 15 Years of Age^*,†
*^ Patients in these adjunctive trials were receiving 1 to 2 concomitant antiepileptic drugs in addition to topiramate or placebo**
^† Values represent the percentage of patients reporting a given adverse reaction. Patients may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category
Body System/Adverse Reaction	Placebo (N=101) %	200 (N=98) %
Body as a Whole-General Disorders
Fatigue	5	16
Injury	13	14
Central & Peripheral Nervous System Disorders
Gait abnormal	5	8
Ataxia	2	6
Hyperkinesia	4	5
Dizziness	2	4
Speech disorders/Related speech problems	2	4
Gastro-Intestinal System Disorders
Nausea	5	6
Saliva increased	4	6
Constipation	4	5
Gastroenteritis	2	3
Metabolic and Nutritional Disorders
Weight loss	1	9
Platelet, Bleeding & Clotting Disorders
Purpura	4	8
Epistaxis	1	4
Psychiatric Disorders
Somnolence	16	26
Anorexia	15	24
Nervousness	7	14
Personality disorder (Behavior Problems)	9	11
Difficulty with concentration/attention	2	10
Aggressive reaction	4	9
Insomnia	7	8
Difficulty with memory	0	5
Confusion	3	4
Psychomotor slowing	2	3
Resistance Mechanism Disorders
Infection viral	3	7
Respiratory System Disorders
Pneumonia	1	5
Skin and Appendages Disorders
Skin Disorder	2	3
Urinary System Disorders
Urinary incontinence	2	4

Table 6 Adverse Reactions in Pooled, Placebo-Controlled, Migraine Trials in Adults^*,†,‡
*^ Includes 35 adolescent patients age 12 to 15 years**
^† Values represent the percentage of patients reporting a given reaction. Patients may have reported more than one adverse reaction during the study and can be included in more than one adverse reaction category.
^‡ Blurred vision was the most common term considered as vision abnormal. Blurred vision was an included term that accounted for more than 50% of reactions coded as vision abnormal, a preferred term
Body System/ Adverse Reaction	Placebo (N = 445) %	Topiramate Dosage (mg/day)
50 (N = 235) %	100 (N = 386) %
Body as a Whole-General Disorders
Fatigue	11	14	15
Injury	7	9	6
Central & Peripheral Nervous System Disorders
Paresthesia	6	35	51
Dizziness	10	8	9
Hypoaesthesia	2	6	7
Language problems	2	7	6
Gastro-Intestinal System Disorders
Nausea	8	9	13
Diarrhea	4	9	11
Abdominal pain	5	6	6
Dyspepsia	3	4	5
Dry mouth	2	2	3
Gastroenteritis	1	3	3
Metabolic and Nutritional Disorders
Weight loss	1	6	9
Musculoskeletal System Disorders
Arthralgia	2	7	3
Psychiatric Disorders
Anorexia	6	9	15
Somnolence	5	8	7
Difficulty with memory	2	7	7
Insomnia	5	6	7
Difficulty with concentration/attention	2	3	6
Mood problems	2	3	6
Anxiety	3	4	5
Depression	4	3	4
Nervousness	2	4	4
Confusion	2	2	3
Psychomotor slowing	1	3	2
Reproductive Disorders, Female
Menstrual disorder	2	3	2
Reproductive Disorders, Male
Ejaculation premature	0	3	0
Resistance Mechanism Disorders
Viral infection	3	4	4
Respiratory System Disorders
Upper respiratory tract infection	12	13	14
Sinusitis	6	10	6
Pharyngitis	4	5	6
Coughing	2	2	4
Bronchitis	2	3	3
Dyspnea	2	1	3
Skin and Appendages Disorders
Pruritis	2	4	2
Special Senses Other, Disorders
Taste perversion	1	15	8
Urinary System Disorders
Urinary tract infection	2	4	2
Vision Disorders
Blurred vision	2	4	2

Table 7 Adverse Reactions in Pooled Double-Blind Studies for the Preventive Treatment of Migraine in Pediatric Patients 12 to 17 Years of Age)^*†
*^ 35 adolescent patients aged 12 to <16 years were also included in adverse reaction assessment for adults**
^† ^{Incidence is based on the number of subjects experiencing at least 1 adverse event, not the number of events.}
Body System/ Adverse Reaction	Placebo (N=45) %	Immediate-Release Topiramate Dosage
50 mg/day (N=46) %	100 mg/day (N=48) %
Body as a Whole – General Disorders
Fatigue	7	7	8
Fever	2	4	6
Central & Peripheral Nervous System Disorders
Paresthesia	7	20	19
Dizziness	4	4	6
Gastro-Intestinal System Disorders
Abdominal pain	9	7	15
Nausea	4	4	8
Metabolic and Nutritional Disorders
Weight loss	2	7	4
Psychiatric Disorders
Anorexia	4	9	10
Somnolence	2	2	6
Insomnia	2	9	2
Resistance Mechanism Disorders
Infection viral	4	4	8
Respiratory System Disorders
Upper respiratory tract infection	11	26	23
Rhinitis	2	7	6
Sinusitis	2	9	4
Coughing	0	7	2
Special Sense Other, Disorders
Taste perversion	2	2	6
Vision Disorders
Conjunctivitis	4	7	4

Table 9 Summary of AED Interactions with Topiramate
* =Plasma concentration increased 25% in some patients, generally those on a twice a day dosing regimen of phenytoin
† =Is not administered but is an active metabolite of carbamazepine
NC=Less than 10% change in plasma concentration
AED=Antiepileptic drug
NE=Not evaluated
TPM=topiramate
AED Coadministered	AED Concentration	Topiramate Concentration
Phenytoin	NC or 25% increase*	48% decrease
Carbamazepine (CBZ)	NC	40% decrease
CBZ epoxide^†	NC	NE
Valproic acid	11% decrease	14% decrease
Phenobarbital	NC	NE
Primidone	NC	NE
Lamotrigine	NC at TPM doses up to 400 mg per day	13% decrease

Table 10 Immediate Release Topiramate Dose Summary During the Stabilization Periods of Each of Six Double-Blind, Placebo-Controlled, Adjunctive Trials in Adults with Partial-Onset Seizures*
* Dose-response studies were not conducted for other indications or pediatric partial-onset seizures.
^† Placebo dosages are given as the number of tablets. Placebo target dosages were as follows: Study 4 (4 tablets/day); Studies 2 and 5 (6 tablets/day); Studies 6 and 7 (8 tablets/day); Study 3 (10 tablets/day).
Target Topiramate Dosage (mg per day)
Study	Stabilization Dose	Placebo^†	200	400	600	800	1,000
2	N	42	42	40	41	-	-
Mean Dose	5.9	200	390	556	-	-
Median Dose	6	200	400	600	-	-
3	N	44	-	-	40	45	40
Mean Dose	9.7	-	-	544	739	796
Median Dose	10	-	-	600	800	1,000
4	N	23	-	19	-	-	-
Mean Dose	3.8	-	395	-	-	-
Median Dose	4	-	400	-	-	-
5	N	30	-	-	28	-	-
Mean Dose	5.7	-	-	522	-	-
Median Dose	6	-	-	600	-	-
6	N	28	-	-	-	25	-
Mean Dose	8	-	-	-	568	-
Median Dose	8	-	-	-	600	-
7	N	90	157	-	-	-	-
Mean Dose	8	200	-	-	-	-
Median Dose	8	200	-	-	-	-

Table 11 Efficacy Results in Double-Blind, Placebo-Controlled, Adjunctive Epilepsy Trials
Comparisons with placebo:
* For Studies 8 and 9, specified target dosages (<9.3 mg/kg/day) were assigned based on subject's weight to approximate a dosage of 6mg/kg per day; these dosages corresponded to mg/day dosages of 125, 175, 225, and 400 mg/day
^†p=0.080;
^‡p ≤ 0.010;
^§p ≤ 0.001;
^¶p ≤ 0.050;
^#p=0.065;
^Þp ≤ 0.005;
^ß Studies included pediatric patients 2 years of age and older, an age group for which topiramate extended-release capsules are not indicated [see Indications and Usage (1.2) and Use in Specific Populations (8.4)]
^àMedian % reduction and % responders are reported for PGTC seizures;
^èMedian % reduction and % responders for drop attacks, i.e., tonic or atonic seizures
p=0.071;
ØPercentage of subjects who were minimally, much, or very much improved from baseline.
Target Topiramate Dosage (mg per day)
Study #	#	Placebo	200	400	600	800	1,000	≈6mg/kg/day*
Partial Onset Seizures Studies in Adults
2	N	45	45	45	46	-	-	-
Median % Reduction	12	27^†	48^‡	45^§	-	-	-
% Responders	18	24	44^¶	46^¶	-	-	-
3	N	47	-	-	48	48	47	-
Median % Reduction	2	-	-	41^§	41^§	36^§
% Responders	9	-	-	40^§	41^§	36^¶
4	N	24	-	23	-	-	-	-
Median % Reduction	1	-	41^#	-	-	-	-
% Responders	8	-	35^¶	-	-	-	-
5	N	30	-	-	30	-	-	-
Median % Reduction	-12	-	-	46^Þ	-	-	-
% Responders	10	-	-	47^§	-	-	-
6	N	28	-	-	-	28	-	-
Median % Reduction	-21	-	-	-	24^§	-	-
% Responders	0	-	-	-	43^§	-	-
7	N	91	168	-	-	-	-	-
Median % Reduction	20	44^§	-	-	-	-	-
% Responders	24	45^§
Partial Onset Seizures Studies in Pediatric Patients^ß
8	N	45	-	-	-	-	-	41
Median % Reduction	11	-	-	-	-	-	33^¶
% Responders	20	-	-	-	-	-	39
Primary Generalized Tonic-Clonic^{à, ß}
9	N	40	-	-	-	-	-	39
Median % Reduction	9	-	-	-	-	-	57^¶
% Responders	20	-	-	-	-	-	56^§
Lennox-Gastaut Syndrome^{è, ß}
10	N	49	-	-	-	-	-	46
Median % Reduction	-5	-	-	-	-	-	15^¶
% Responders	14						28
Improvement in Seizure SeverityØ	28						52^¶

Table 12 Percent Reduction from Baseline to the Last 12 Weeks of Double-Blind Phase in Average Monthly Attack Rate: Study 13 (Intent-to-Treat Analysis Set)
^*P-values (two-sided) for comparisons relative to placebo are generated by applying an ANCOVA model on ranks that includes subject's stratified age at baseline, treatment group, and analysis center as factors and monthly migraine attack rate during baseline period as a covariate.
^†P-values for the dose groups are the adjusted p-value according to the Hochberg multiple comparison procedure.
^‡Indicates p-value is < 0.05 (two-sided).
Category	Placebo (N=33)	Immediate-Release Topiramate 50 mg/day (N=35)	Immediate-Release Topiramate 100 mg/day (N=35)
Baseline
Median	3.6	4.0	4.0
Last 12 Weeks of Double-Blind Phase
Median	2.3	2.3	1.0
Percent Reduction (%)
Median	44.4	44.6	72.2
P-value versus Placebo^*,†		0.7975	0.0164^‡

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Week 1	50 mg once daily
Week 2	100 mg once daily
Week 3	150 mg once daily
Week 4	200 mg once daily
Week 5	300 mg once daily
Week 6	400 mg once daily

Safety Parameter	Treatment Difference in Least Square Means (95 % Confidence Interval)
Annual Change in BMD Lumbar Spine (g/cm²)	-0.036 (-0.058, -0.014)
*Annual Change in BMD TBLH (g/cm²)**	-0.026 (-0.039, -0.012)
Annual Change in Height (cm) (4 years to 9 years, Primary Analysis Population for Height) **	-0.84 (-2.67, 0.99)
Annual Change in Height (cm) (4 years to 15 years)	-0.75 (-2.21, 0.71)
Annual Change in Height (cm) (10 years to 15 years)	-1.01 (-3.64, 1.61)
Height Velocity (cm/year) (4 years to 9 years)	-1.00 (-2.76, 0.76)
Height Velocity (cm/year) (4 years to 15 years)	-0.98 (-2.33, 0.37)
Height Velocity (cm/year) (10 years to 15 years)	-0.96 (-3.24, 1.32)
Annual Change in Weight (kg)	-2.05 (-3.66, -0.45)

MEDICATION GUIDE Topiramate (toe pir' a mate) Extended-Release Capsules
What is the most important information I should know about topiramate extended-release capsules? Take topiramate extended-release capsules whole. Do not sprinkle topiramate extended-release capsules on food or break, crush, dissolve or chew topiramate extended-release capsules before swallowing. If you cannot swallow topiramate extended-release capsules whole, tell your healthcare provider. You may need a different medicine. Do not drink alcohol within 6 hours prior to and 6 hours after topiramate extended-release capsules administration. Topiramate extended-release capsules may cause eye problems. Serious eye problems include: any sudden decrease in vision with or without eye pain and redness, a blockage of fluid in the eye causing increased pressure in the eye (secondary angle closure glaucoma). These eye problems can lead to permanent loss of vision if not treated. You should call your healthcare provider right away if you have any new eye symptoms, including any new problems with your vision. Topiramate extended-release capsules may cause decreased sweating and increased body temperature (fever). People, especially children, should be watched for signs of decreased sweating and fever, especially in hot temperatures. Some people may need to be hospitalized for this condition. If a high fever, a fever that does not go away or decreased sweating develops, call your healthcare provider right away. Topiramate extended-release capsules can increase the level of acid in your blood (metabolic acidosis). If left untreated, metabolic acidosis can cause brittle or soft bones (osteoporosis, osteomalacia, osteopenia), kidney stones, can slow the rate of growth in children and may possibly harm your baby if you are pregnant. Metabolic acidosis can happen with or without symptoms. Sometimes people with metabolic acidosis will: feel tired not feel hungry (loss of appetite) feel changes in heartbeat have trouble thinking clearly Your healthcare provider should do a blood test to measure the level of acid in your blood before and during your treatment with topiramate extended-release capsules. If you are pregnant, you should talk to your healthcare provider about whether you have metabolic acidosis. Like other antiepileptic drugs, topiramate extended-release capsules may cause suicidal thoughts or actions in a very small number of people, about 1 in 500. Call a healthcare provider right away if you have any of these symptoms, especially if they are new, worse or worry you:
thoughts about suicide or dying	trouble sleeping (insomnia)
attempts to commit suicide	new or worse irritability
new or worse depression	acting aggressive, being angry or violent
new or worse anxiety	acting on dangerous impulse
feeling agitated or restless	an extreme increase in activity and talking (mania)
panic attacks	other unusual changes in behavior or mood
Do not stop topiramate extended-release capsules without first talking to a healthcare provider. Stopping topiramate extended-release capsules suddenly can cause serious problems. Suicidal thoughts or actions can be caused by things other than medicines. If you have suicidal thoughts or actions, your healthcare provider may check for other causes. How can I watch for early symptoms of suicidal thoughts and actions? Pay attention to any changes, especially sudden changes, in mood, behaviors, thoughts or feelings. Keep all follow-up visits with your healthcare provider as scheduled. Call your healthcare provider between visits as needed, especially if you are worried about symptoms. Topiramate extended-release capsules can harm your unborn baby. If you take topiramate extended-release capsules during pregnancy, your baby has a higher risk for birth defects called cleft lip and cleft palate. These defects can begin early in pregnancy, even before you know you are pregnant. Cleft lip and cleft palate may happen even in children born to women who are not taking any medicines and do not have other risk factors. There may be other medicines to treat your condition that have a lower chance of birth defects. All women of childbearing age should talk to their healthcare providers about using other possible treatments instead of topiramate extended-release capsules. If the decision is made to use topiramate extended-release capsules, you should use effective birth control (contraception) unless you are planning to become pregnant. You should talk to your doctor about the best kind of birth control to use while you are taking topiramate extended-release capsules. Tell your healthcare provider right away if you become pregnant while taking topiramate extended-release capsules. You and your healthcare provider should decide if you will continue to take topiramate extended-release capsules while you are pregnant. If you take topiramate extended-release capsules during pregnancy, your baby may be smaller than expected at birth. The long-term effects of this are not known. Talk to your healthcare provider if you have questions about this risk during pregnancy. Metabolic acidosis may have harmful effects on your baby. Talk to your healthcare provider if topiramate extended-release capsules have caused metabolic acidosis during your pregnancy. Pregnancy Registry: If you become pregnant while taking topiramate extended-release capsules, talk to your healthcare provider about registering with the North American Antiepileptic Drug Pregnancy Registry. You can enroll in this registry by calling 1-888-233-2334. The purpose of this registry is to collect information about the safety of topiramate extended-release capsules and other antiepileptic drugs during pregnancy. Topiramate extended-release capsules may decrease the density of bones when used over a long period. Topiramate extended-release capsules may slow height increase and weight gain in children and adolescents when used over a long period.
What are topiramate extended-release capsules? Topiramate extended-release capsules are a prescription medicine used: to treat certain types of seizures (partial onset seizures and primary generalized tonic-clonic seizures) in people 6 years and older, with other medicines to treat certain types of seizures (partial onset seizures, primary generalized tonic-clonic seizures and seizures associated with Lennox-Gastaut syndrome) in adults and children 6 years and older to prevent migraine headaches in adults and adolescents 12 years of age and older. Before taking topiramate extended-release capsules, tell your healthcare provider about all of your medical conditions, including if you: have or have had depression, mood problems or suicidal thoughts or behavior have kidney problems, kidney stones or are getting kidney dialysis have a history of metabolic acidosis (too much acid in the blood) have liver problems have weak, brittle or soft bones (osteomalacia, osteoporosis, osteopenia or decreased bone density) have lung or breathing problems have eye problems, especially glaucoma have diarrhea have a growth problem are on a diet high in fat and low in carbohydrates, which is called a ketogenic diet are having surgery are pregnant or plan to become pregnant are breastfeeding. Topiramate passes into your breast milk. Breastfed babies may be sleepy or have diarrhea. It is not known if the topiramate that passes into breast milk can cause other serious harm to your baby. Talk to your healthcare provider about the best way to feed your baby if you take topiramate extended-release capsules. Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins and herbal supplements. Especially, tell your healthcare provider if you take: Valproic acid (such as DEPAKENE or DEPAKOTE) any medicines that impair or decrease your thinking, concentration or muscle coordination birth control pills. Topiramate extended-release capsules may make your birth control pills less effective. Tell your healthcare provider if your menstrual bleeding changes while you are taking birth control pills and topiramate extended-release capsules. Ask your healthcare provider if you are not sure if your medicine is uled above. Know the medicines you take. Keep a ul of them to show your healthcare provider and pharmacist each time you get a new medicine. Do not start a new medicine without talking with your healthcare provider.
How should I take topiramate extended-release capsules? Take topiramate extended-release capsules exactly as prescribed. Your healthcare provider may change your dose. Do not change your dose without talking to your healthcare provider. Take topiramate extended-release capsules whole. Do not sprinkle topiramate extended-release capsules on food or break, crush, dissolve or chew topiramate extended-release capsules before swallowing. Topiramate extended-release capsules can be taken before, during or after a meal. Drink plenty of fluids during the day. This may help prevent kidney stones while taking topiramate extended-release capsules. If you take too much topiramate extended-release capsules, call your healthcare provider right away or go to the nearest emergency room. Talk to your health care provider on what you should do if you miss a dose. Do not stop taking topiramate extended-release capsules without talking to your healthcare provider. Stopping topiramate extended-release capsules suddenly may cause serious problems. If you have epilepsy and you stop taking topiramate extended-release capsules suddenly, you may have seizures that do not stop. Your healthcare provider will tell you how to stop taking topiramate extended-release capsules slowly. Your healthcare provider may do blood tests while you take topiramate extended-release capsules.
What should I avoid while taking topiramate extended-release capsules? Do not drink alcohol within 6 hours before or 6 hours after taking topiramate extended-release capsules. Topiramate extended-release capsules and alcohol can cause serious side effects such as severe sleepiness and dizziness and an increase in seizures. Do not drive a car or operate heavy machinery until you know how topiramate extended-release capsules affect you. Topiramate extended-release capsules can slow your thinking and motor skills and may affect vision.
What are the possible side effects of topiramate extended-release capsules? Topiramate extended-release capsules may cause serious side effects, including: See "What is the most important information I should know about topiramate extended-release capsules?" Serious skin reactions. Topiramate extended-release capsules may cause a severe rash with bulers and peeling skin, especially around the mouth, nose, eyes and genitals (Stevens-Johnson syndrome). Topiramate extended-release capsules may also cause a rash with bulers and peeling skin over much of the body that may cause death (toxic epidermal necrolysis). Call your healthcare provider right away if you develop a skin rash or bulers. High blood ammonia levels. High ammonia in the blood can affect your mental activities, slow your alertness, make you feel tired or cause vomiting. This has happened when topiramate extended-release capsules are taken with a medicine called valproic acid (DEPAKENE and DEPAKOTE). Kidney stones. Drink plenty of fluids when taking topiramate extended-release capsules to decrease your chances of getting kidney stones. Low body temperature. Taking topiramate extended-release capsules when you are also taking valproic acid cause a drop in body temperature to less than 95ºF, feeling tired, confusion or coma. Effects on thinking and alertness. Topiramate extended-release capsules may affect how you think and cause confusion, problems with concentration, attention, memory or speech. Topiramate extended-release capsules may cause depression or mood problems, tiredness and sleepiness. Dizziness or loss of muscle coordination. Call your healthcare provider right away if you have any of the symptoms above. The most common side effects of topiramate extended-release capsules include:
tingling of the arms and legs (paresthesia)	nervousness	fever
not feeling hungry	speech problems	tiredness
nausea	dizziness	sleepiness/drowsiness
weight loss	slow reactions	difficulty with memory
abnormal vision	upper respiratory tract infection	diarrhea
a change in the way foods taste		pain in abdomen
		decreased feeling or sensitivity, especially in the skin
Tell your healthcare provider about any side effect that bothers you or that does not go away. These are not all the possible side effects of topiramate extended-release capsules. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
How should I store topiramate extended-release capsules? Store topiramate extended-release capsules at room temperature between 20° to 25°C (68° to 77°F). Topiramate extended-release capsules 25 mg, 50 mg and 100 mg come in child-resistant bottle pack of 30's, 90's and 100's and 200 mg come in child-resistant bottle pack of 30's and 100's and buler pack of 30's. Keep topiramate extended-release capsules and all medicines out of the reach of children. Keep topiramate extended-release capsules in a tightly closed container. Keep topiramate extended-release capsules dry and away from moisture and light.
General information about the safe and effective use of topiramate extended-release capsules. Medicines are sometimes prescribed for purposes other than those uled in a Medication Guide. Do not use topiramate extended-release capsules for a condition for which it was not prescribed. Do not give topiramate extended-release capsules to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about topiramate extended-release capsules that is written for health professionals.
What are the ingredients in topiramate extended-release capsules? Active ingredient: topiramate, USP Inactive ingredients: ethyl cellulose, hypromellose, microcrystalline cellulose, polyethylene glycol, talc and triethyl citrate. Additionally, each 25 mg, 50 mg and 100 mg capsule contain hydrogenated castor oil and povidone and each 200 mg capsule contains hydroxypropyl cellulose. The capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide and water. The capsule is imprinted with black pharmaceutical ink and contains following inactive ingredients: black iron oxide, potassium hydroxide and shellac. For more information, go to MedicalAffairs@zydususa.com or Tel.: 1-877-993-8779. The brands uled are registered trademark of their respective owners. Medication Guide available at www.zydususa.com/medguides or call 1-877-993-8779.
Manufactured by: Zydus Lifesciences Ltd. Ahmedabad, India Distributed by: Zydus Pharmaceuticals (USA) Inc. Pennington, NJ 08534
Rev.: 04/23
This Medication Guide has been approved by the U.S. Food and Drug Administration.

Topiramate (topiramate 100 mg) Dailymed

Drug Classes

Version History

Generic: topiramate is used for the treatment of Bipolar Disorder Epilepsies, Partial Epilepsy, Tonic-Clonic Migraine Disorders Pain Spasms, Infantile Lennox Gastaut Syndrome

All Imprints

FDA Adverse Reactions

Recent Major Changes

1 Indications And Usage

1.1 Monotherapy Epilepsy

1.2 Adjunctive Therapy Epilepsy

1.3 Migraine

2 Dosage And Administration

2.1 Dosing in Monotherapy Epilepsy

2.2 Dosing in Adjunctive Therapy Epilepsy

2.3 Dosing

2.4 Administration With Alcohol

2.5 Dose Modifications in Patients With Renal Impairment

2.6 Dosage Modifications in Patients Undergoing Hemodialysis

2.7 Administration Instructions

3 Dosage Forms And Strengths

4 Contraindications

5 Warnings And Precautions

5.1 Acute Myopia and Secondary Angle Closure Glaucoma Syndrome

5.2 Visual Field Defects

5.3 Oligohydrosis and Hyperthermia

5.4 Metabolic Acidosis

5.5 Interaction With Alcohol

5.6 Suicidal Behavior and Ideation

5.7 Cognitive/Neuropsychiatric Adverse Reactions

5.8 Fetal Toxicity

5.9 Withdrawal of Antiepileptic Drugs

5.10 Decrease in Bone Mineral Density

5.11 Negative Effects on Growth (Height and Weight)

5.12 Serious Skin Reactions

5.13 Hyperammonemia and Encephalopathy (Without and With Concomitant Valproic Acid Use)

5.14 Kidney Stones

5.15 Hypothermia With Concomitant Valproic Acid Use

6 Adverse Reactions

6.1 Clinical Trials Experience

6.2 Postmarketing Experience

7 Drug Interactions

7.1 Alcohol

7.2 Antiepileptic Drugs

7.3 Other Carbonic Anhydrase Inhibitors

7.4 CNS Depressants

7.5 Oral Contraceptives

7.6 Hydrochlorothiazide (HCTZ)

7.7 Pioglitazone

7.8 Lithium

7.9 Amitriptyline

8 Use In Specific Populations

8.1 Pregnancy

8.2 Lactation

8.3 Females and Males of Reproductive Potential

8.4 Pediatric Use

8.5 Geriatric Use

8.6 Renal Impairment

8.7 Patients Undergoing Hemodialysis

10 Overdosage

11 Description

12 Clinical Pharmacology

12.1 Mechanism of Action

12.2 Pharmacodynamics

12.3 Pharmacokinetics

12.6 Relative Bioavailability of Topiramate Extended-Release capsules Compared to Immediate-Release Topiramate

13 Nonclinical Toxicology

13.1 Carcinogenesis, Mutagenesis, and Impairment of Fertility

14 Clinical Studies

14.1 Bridging Study to Demonstrate Pharmacokinetic Equivalence between Extended-Release and Immediate-Release Topiramate Formulations

14.2 Monotherapy Epilepsy

14.3 Adjunctive Therapy Epilepsy

14.4

16 How Supplied/storage And Handling

16.1 How Supplied

16.2 Storage and Handling

17 Patient Counseling Information

Spl Unclassified

Spl Medguide

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