WELLBUTRIN (bupropion hydrochloride 300 mg) Dailymed
Generic: bupropion hydrochloride
IMPRINT: WELLBUTRIN XL 150
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bupropion hydrochloride 150 mg - wellbutrin xl 150 round white
bupropion hydrochloride 300 mg - wellbutrin xl 300 round white
Boxed Warning
Warning
Suicidality and Antidepressant Drugs
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Warning
Suicidality and Antidepressant Drugs
Use in Treating Psychiatric Disorders: Antidepressants increased the risk compared to placebo of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults in short-term studies of major depressive disorder (MDD) and other psychiatric disorders. Anyone considering the use of WELLBUTRIN XL®* or any other antidepressant in a child, adolescent, or young adult must balance this risk with the clinical need. Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction in risk with antidepressants compared to placebo in adults aged 65 and older. Depression and certain other psychiatric disorders are themselves associated with increases in the risk of suicide. Patients of all ages who are started on antidepressant therapy should be monitored appropriately and observed closely for clinical worsening, suicidality, or unusual changes in behavior. Families and caregivers should be advised of the need for close observation and communication with the prescriber. WELLBUTRIN XL is not approved for use in pediatric patients. (See WARNINGS: Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders, PRECAUTIONS: Information for Patients, and PRECAUTIONS: Pediatric Use.)
Use in Smoking Cessation Treatment: WELLBUTRIN®*, WELLBUTRIN SR and WELLBUTRIN XL are not approved for smoking cessation treatment, but bupropion under the name ZYBAN®* is approved for this use. Serious neuropsychiatric events, including but not limited to depression, suicidal ideation, suicide attempt, and completed suicide have been reported in patients taking bupropion for smoking cessation. Some cases may have been complicated by the symptoms of nicotine withdrawal in patients who stopped smoking. Depressed mood may be a symptom of nicotine withdrawal. Depression, rarely including suicidal ideation, has been reported in smokers undergoing a smoking cessation attempt without medication. However, some of these symptoms have occurred in patients taking bupropion who continued to smoke.
All patients treated with Bupropion for smoking cessation treatment should be observed for neuropsychiatric symptoms including changes in behavior, hostility, agitation, depressed mood, and suicide-related events, including ideation, behavior, and attempted suicide. These symptoms, as well as worsening of pre-existing psychiatric illness and completed suicide have been reported in some patients attempting to quit smoking while taking ZYBAN in the post-marketing experience. When symptoms were reported, most were during treatment with ZYBAN, but some were following discontinuation of treatment with ZYBAN. These events have occurred in patients with and without pre-existing psychiatric disease; some have experienced worsening of their psychiatric illnesses. Patients with serious psychiatric illness such as schizophrenia, bipolar disorder, and major depressive disorder did not participate in the pre-marketing studies of ZYBAN.
Advise patients and caregivers that the patient using bupropion for smoking cessation should stop taking bupropion and contact a healthcare provider immediately if agitation, hostility, depressed mood, or changes in thinking or behavior that are not typical for the patient are observed, or if the patient develops suicidal ideation or suicidal behavior. In many post-marketing cases, resolution of symptoms after discontinuation of ZYBAN was reported, although in some cases the symptoms persisted; therefore, ongoing monitoring and supportive care should be provided until symptoms resolve.
The risks of using bupropion for smoking cessation should be weighed against the benefits of its use. ZYBAN has been demonstrated to increase the likelihood of abstinence from smoking for as long as six months compared to treatment with placebo. The health benefits of quitting smoking are immediate and substantial. (See WARNINGS: Neuropsychiatric Symptoms and Suicide Risk in Smoking Cessation Treatment and PRECAUTIONS: Information for Patients.)
Description Section
DESCRIPTION
WELLBUTRIN XL (bupropion hydrochloride), an antidepressant of the aminoketone class, is chemically unrelated to tricyclic, tetracyclic, selective serotonin re-uptake inhibitor, or other known antidepressant agents. Its structure closely resembles that of diethylpropion; it is related to phenylethylamines. It is designated as (±)-1-(3-chlorophenyl)-2-[(1,1-dimethylethyl)amino]-1-propanone hydrochloride. The molecular weight is 276.2. The molecular formula is C13H18ClNO•HCl. Bupropion hydrochloride powder is white, crystalline, and highly soluble in water. It has a bitter taste and produces the sensation of local anesthesia on the oral mucosa. The structural formula is:
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WELLBUTRINÂ XL is supplied for oral administration as 150-mg and 300-mg, creamy-white to pale yellow extended-release tablets. Each tablet contains the labeled amount of bupropion hydrochloride and the inactive ingredients: ethylcellulose aqueous dispersion,glyceryl behenate, methacrylic acid copolymer dispersion, polyvinyl alcohol, polyethylene glycol, povidone, silicon dioxide, and triethyl citrate. The tablets are printed with edible black ink.
The insoluble shell of the extended-release tablet may remain intact during gastrointestinal transit and is eliminated in the feces.
Clinical Pharmacology
PHARMACODYNAMICS SECTION
Pharmacodynamics: Bupropion is a relatively weak inhibitor of the neuronal uptake of norepinephrine and dopamine, and does not inhibit monoamine oxidase or the re-uptake of serotonin. While the mechanism of action of bupropion, as with other antidepressants, is unknown, it is presumed that this action is mediated by noradrenergic and/or dopaminergic mechanisms.
PHARMACOKINETICS SECTION
Pharmacokinetics: Bupropion is a racemic mixture. The pharmacologic activity and pharmacokinetics of the individual enantiomers have not been studied. The mean elimination half-life (±SD) of bupropion after chronic dosing is 21 (±9) hours, and steady-state plasma concentrations of bupropion are reached within 8 days.
In a study comparing 14-day dosing with WELLBUTRINÂ XL 300 mg once daily to the immediate-release formulation of bupropion at 100 mg 3 times daily, equivalence was demonstrated for peak plasma concentration and area under the curve for bupropion and the 3 metabolites (hydroxybupropion, threohydrobupropion, and erythrohydrobupropion). Additionally, in a study comparing 14-day dosing with WELLBUTRINÂ XL 300 mg once daily to the sustained-release formulation of bupropion at 150 mg 2 times daily, equivalence was demonstrated for peak plasma concentration and area under the curve for bupropion and the 3 metabolites.
Absorption: Following oral administration of WELLBUTRINÂ XL to healthy volunteers, time to peak plasma concentrations for bupropion was approximately 5 hours and food did not affect the Cmax or AUC of bupropion.
Distribution: In vitro tests show that bupropion is 84% bound to human plasma proteins at concentrations up to 200 mcg/mL. The extent of protein binding of the hydroxybupropion metabolite is similar to that for bupropion, whereas the extent of protein binding of the threohydrobupropion metabolite is about half that seen with bupropion.
Metabolism: Bupropion is extensively metabolized in humans. Three metabolites have been shown to be active: hydroxybupropion, which is formed via hydroxylation of the tert-butyl group of bupropion, and the amino-alcohol isomers threohydrobupropion and erythrohydrobupropion, which are formed via reduction of the carbonyl group. In vitro findings suggest that cytochrome P450IIB6 (CYP2B6) is the principal isoenzyme involved in the formation of hydroxybupropion, while cytochrome P450 isoenzymes are not involved in the formation of threohydrobupropion. Oxidation of the bupropion side chain results in the formation of a glycine conjugate of meta-chlorobenzoic acid, which is then excreted as the major urinary metabolite. The potency and toxicity of the metabolites relative to bupropion have not been fully characterized. However, it has been demonstrated in an antidepressant screening test in mice that hydroxybupropion is one half as potent as bupropion, while threohydrobupropion and erythrohydrobupropion are 5-fold less potent than bupropion. This may be of clinical importance because the plasma concentrations of the metabolites are as high or higher than those of bupropion.
Because bupropion is extensively metabolized, there is the potential for drug-drug interactions, particularly with those agents that are metabolized by or which inhibit /induce the cytochrome P450IIB6 (CYP2B6) isoenzyme, such as ritonavir or efavirenz. In a healthy volunteer study, ritonavir at a dose of 100 mg twice daily reduced the AUC and C max of bupropion by 22% and 21%, respectively. The exposure of the hydroxybupropion metabolite was decreased by 23%, the threohydrobupropion decreased by 38%, and the erythrohydrobupropion decreased by 48%.
In a second healthy volunteer study, ritonavir at a dose of 600 mg twice daily decreased the AUC and the Cmax of bupropion by 66% and 62%, respectively. The exposure of the hydroxybupropion metabolite was decreased by 78%, the threohydrobupropion decreased by 50%, and the erythrohydrobupropion decreased by 68%.
In another healthy volunteer study, KALETRA® * (lopinavir 400 mg/ritonavir 100 mg twice daily) decreased bupropion AUC and C max by 57%. The AUC and Cmax of hydroxybupropion were decreased by 50% and 31%, respectively, (see PRECAUTIONS: Drug Interactions).
In a study in healthy volunteers, efzvirenz 600mg once daily for 2 weeks reduces the AUC and Cmax of bupropion by approximately 55% and 34%, respectively. The AUC of hydroxybupropion was unchanged, whereas Cmax of hydroxybupropion was increased by 50%.
Although bupropion is not metabolized by cytochrome P450IID6 (CYP2D6), there is the potential for drug-drug interactions when bupropion is coadministered with drugs metabolized by this isoenzyme (see PRECAUTIONS: Drug Interactions ).
In humans, peak plasma concentrations of hydroxybupropion occur approximately 7 hours after administration of WELLBUTRIN XL. Following administration of WELLBUTRIN XL, peak plasma concentrations of hydroxybupropion are approximately 7 times the peak level of the parent drug at steady state. The elimination half-life of hydroxybupropion is approximately 20 (±5) hours, and its AUC at steady state is about 13 times that of bupropion. The times to peak concentrations for the erythrohydrobupropion and threohydrobupropion metabolites are similar to that of the hydroxybupropion metabolite. However, their elimination half-lives are longer, approximately 33 (±10) and 37 (±13) hours, respectively, and steady-state AUCs are 1.4 and 7 times that of bupropion, respectively.
Bupropion and its metabolites exhibit linear kinetics following chronic administration of 300 to 450Â mg/day.
Elimination: Following oral administration of 200Â mg of 14C-bupropion in humans, 87% and 10% of the radioactive dose were recovered in the urine and feces, respectively. However, the fraction of the oral dose of bupropion excreted unchanged was only 0.5%, a finding consistent with the extensive metabolism of bupropion.
Population Subgroups: Factors or conditions altering metabolic capacity (e.g., liver disease, congestive heart failure [CHF], age, concomitant medications, etc.) or elimination may be expected to influence the degree and extent of accumulation of the active metabolites of bupropion. The elimination of the major metabolites of bupropion may be affected by reduced renal or hepatic function because they are moderately polar compounds and are likely to undergo further metabolism or conjugation in the liver prior to urinary excretion.
Hepatic: The effect of hepatic impairment on the pharmacokinetics of bupropion was characterized in 2 single-dose studies, one in patients with alcoholic liver disease and one in patients with mild to severe cirrhosis. The first study showed that the half-life of hydroxybupropion was significantly longer in 8 patients with alcoholic liver disease than in 8 healthy volunteers (32±14 hours versus 21±5 hours, respectively). Although not statistically significant, the AUCs for bupropion and hydroxybupropion were more variable and tended to be greater (by 53% to 57%) in patients with alcoholic liver disease. The differences in half-life for bupropion and the other metabolites in the 2 patient groups were minimal.
The second study showed no statistically significant differences in the pharmacokinetics of bupropion and its active metabolites in 9 patients with mild to moderate hepatic cirrhosis compared to 8 healthy volunteers. However, more variability was observed in some of the pharmacokinetic parameters for bupropion (AUC, Cmax, and Tmax) and its active metabolites (t½) in patients with mild to moderate hepatic cirrhosis. In addition, in patients with severe hepatic cirrhosis, the bupropion Cmax and AUC were substantially increased (mean difference: by approximately 70% and 3-fold, respectively) and more variable when compared to values in healthy volunteers; the mean bupropion half-life was also longer (29 hours in patients with severe hepatic cirrhosis vs 19 hours in healthy subjects). For the metabolite hydroxybupropion, the mean Cmax was approximately 69% lower. For the combined amino-alcohol isomers threohydrobupropion and erythrohydrobupropion, the mean Cmax was approximately 31% lower. The mean AUC increased by about 1½-fold for hydroxybupropion and about 2½-fold for threo/erythrohydrobupropion. The median Tmax was observed 19 hours later for hydroxybupropion and 31 hours later for threo/erythrohydrobupropion. The mean half-lives for hydroxybupropion and threo/erythrohydrobupropion were increased 5- and 2-fold, respectively, in patients with severe hepatic cirrhosis compared to healthy volunteers (see WARNINGS , PRECAUTIONS , and DOSAGE AND ADMINISTRATION ).
Renal : There is limited information on the pharmacokinetics of bupropion in patients with renal impairment. An inter-study comparison between normal subjects and patients with end-stage renal failure demonstrated that the parent drug Cmax and AUC values were comparable in the 2 groups, whereas the hydroxybupropion and threohydrobupropion metabolites had a 2.3- and 2.8-fold increase, respectively, in AUC for patients with end-stage renal failure. A second study, comparing normal subjects and patients with moderate-to-severe renal impairment (GFR 30.9 ± 10.8 mL/min) showed that exposure to a single 150 mg dose sustained-release bupropion was approximately 2-fold higher in patients with impaired renal function while levels of the hydroxybupropion and threo/erythrohydrobupropion (combined) metabolites were similar in the 2 groups. The elimination of bupropion and/or the major metabolites of bupropion may be reduced by impaired renal function (see PRECAUTIONS: Renal Impairment ).
Left Ventricular Dysfunction: During a chronic dosing study with bupropion in 14Â depressed patients with left ventricular dysfunction (history of CHF or an enlarged heart on x-ray), no apparent effect on the pharmacokinetics of bupropion or its metabolites was revealed, compared to healthy volunteers.
Age: The effects of age on the pharmacokinetics of bupropion and its metabolites have not been fully characterized, but an exploration of steady-state bupropion concentrations from several depression efficacy studies involving patients dosed in a range of 300 to 750 mg/day, on a 3 times daily schedule, revealed no relationship between age (18 to 83 years) and plasma concentration of bupropion. A single-dose pharmacokinetic study demonstrated that the disposition of bupropion and its metabolites in elderly subjects was similar to that of younger subjects. These data suggest there is no prominent effect of age on bupropion concentration; however, another pharmacokinetic study, single and multiple dose, has suggested that the elderly are at increased risk for accumulation of bupropion and its metabolites (see PRECAUTIONS: Geriatric Use ).
Gender: A single-dose study involving 12Â healthy male and 12Â healthy female volunteers revealed no sex-related differences in the pharmacokinetic parameters of bupropion.
Smokers: The effects of cigarette smoking on the pharmacokinetics of bupropion were studied in 34Â healthy male and female volunteers; 17 were chronic cigarette smokers and 17 were nonsmokers. Following oral administration of a single 150-mg dose of bupropion, there was no statistically significant difference in Cmax, half-life, Tmax, AUC, or clearance of bupropion or its active metabolites between smokers and nonsmokers.
Clinical Trials
Major Depressive Disorder: The efficacy of bupropion as a treatment for major depressive disorder was established with the immediate-release formulation of bupropion in two 4-week, placebo-controlled trials in adult inpatients and in one 6-week, placebo-controlled trial in adult outpatients. In the first study, patients were titrated in a bupropion dose range of 300 to 600Â mg/day of the immediate-release formulation on a 3Â times daily schedule; 78% of patients received maximum doses of 450Â mg/day or less. This trial demonstrated the effectiveness of bupropion on the Hamilton Depression Rating Scale (HDRS) total score, the depressed mood li (li 1) from that scale, and the Clinical Global Impressions (CGI) severity score. A second study included 2Â fixed doses of the immediate-release formulation of bupropion (300 and 450Â mg/day) and placebo. This trial demonstrated the effectiveness of bupropion, but only at the 450-mg/day dose of the immediate-release formulation; the results were positive for the HDRS total score and the CGI severity score, but not for HDRS li 1. In the third study, outpatients received 300Â mg/day of the immediate-release formulation of bupropion. This study demonstrated the effectiveness of bupropion on the HDRS total score, HDRS li 1, the Montgomery-Asberg Depression Rating Scale, the CGI severity score, and the CGI improvement score.
In a longer-term study, outpatients meeting DSM-IV criteria for major depressive disorder, recurrent type, who had responded during an 8-week open trial on bupropion (150Â mg twice daily of the sustained-release formulation) were randomized to continuation of their same dose of bupropion or placebo, for up to 44Â weeks of observation for relapse. Response during the open phase was defined as CGI Improvement score of 1 (very much improved) or 2 (much improved) for each of the final 3Â weeks. Relapse during the double-blind phase was defined as the investigator's judgment that drug treatment was needed for worsening depressive symptoms. Patients receiving continued bupropion treatment experienced significantly lower relapse rates over the subsequent 44Â weeks compared to those receiving placebo.
Although there are no independent trials demonstrating the antidepressant effectiveness of WELLBUTRINÂ XL, studies have demonstrated similar bioavailability of WELLBUTRINÂ XL to both the immediate-release formulation and to the sustained-release formulation of bupropion under steady-state conditions, i.e., WELLBUTRINÂ XL 300Â mg once daily was shown to have bioavailability that was similar to that of 100Â mg 3Â times daily of the immediate-release formulation of bupropion and to that of 150Â mg 2Â times daily of the sustained-release formulation of bupropion, with regard to both peak plasma concentration and extent of absorption, for parent drug and metabolites.
Seasonal Affective Disorder: The efficacy of WELLBUTRINÂ XL for the prevention of seasonal major depressive episodes associated with seasonal affective disorder was established in 3Â double-blind, placebo-controlled trials in adult outpatients with a history of major depressive disorder with an autumn-winter seasonal pattern (as defined by DSM-IV criteria). Treatment was initiated prior to the onset of symptoms in the autumn (September to November) and was discontinued following a 2Â week taper that began the first week of spring (fourth week of March), resulting in a treatment duration of approximately 4 to 6Â months for the majority of patients. At the start of the study, patients were randomized to receive placebo or WELLBUTRINÂ XL 150Â mg once daily for 1Â week, followed by up-titration to 300Â mg once daily. Patients who were deemed by the investigator to be unlikely or unable to tolerate 300Â mg once daily were allowed to remain on, or had their dose reduced to, 150Â mg once daily. The mean doses of WELLBUTRINÂ XL in the 3 studies ranged from 257 to 280 mg/day.
In these 3Â trials, the percentage of patients who were depression-free at the end of treatment was significantly higher for WELLBUTRINÂ XL than for placebo: 81.4% vs 69.7%, 87.2% vs 78.7%, and 84.0% vs 69.0% for Study 1, 2 and 3, respectively; with a depression-free rate for the 3Â studies combined of 84.3% vs 72.0%.
Indications And Usage
Major Depressive Disorder: WELLBUTRINÂ XL is indicated for the treatment of major depressive disorder.
The efficacy of bupropion in the treatment of a major depressive episode was established in two 4-week controlled trials of inpatients and in one 6-week controlled trial of outpatients whose diagnoses corresponded most closely to the Major Depression category of the APA Diagnostic and Statistical Manual (DSM) (see CLINICAL TRIALS ).
A major depressive episode (DSM-IV) implies the presence of 1) depressed mood or 2) loss of interest or pleasure; in addition, at least 5 of the following symptoms have been present during the same 2-week period and represent a change from previous functioning: depressed mood, markedly diminished interest or pleasure in usual activities, significant change in weight and/or appetite, insomnia or hypersomnia, psychomotor agitation or retardation, increased fatigue, feelings of guilt or worthlessness, slowed thinking or impaired concentration, a suicide attempt, or suicidal ideation.
The efficacy of bupropion in maintaining an antidepressant response for up to 44Â weeks following 8Â weeks of acute treatment was demonstrated in a placebo-controlled trial with the sustained-release formulation of bupropion (see CLINICAL TRIALS ). Nevertheless, the physician who elects to use WELLBUTRINÂ XL for extended periods should periodically reevaluate the long-term usefulness of the drug for the individual patient.
Seasonal Affective Disorder: WELLBUTRINÂ XL is indicated for the prevention of seasonal major depressive episodes in patients with a diagnosis of seasonal affective disorder.
The efficacy of WELLBUTRINÂ XL for the prevention of seasonal major depressive episodes was established in 3Â controlled trials of adult outpatients with a history of major depressive disorder with an autumn-winter seasonal pattern as defined by Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) criteria (see CLINICAL TRIALS ).
Seasonal affective disorder is characterized by recurrent major depressive episodes, most commonly occurring during the autumn and/or winter months. Episodes may last up to 6Â months in duration, typically beginning in the autumn and remitting in the springtime. Although patients with seasonal affective disorder may have depressive episodes during other times of the year, the diagnosis of seasonal affective disorder requires that the number of seasonal episodes substantially outnumber the number of non-seasonal episodes during the individual's lifetime.
Contraindications
WELLBUTRINÂ XL is contraindicated in patients with a seizure disorder.
WELLBUTRIN XL is contraindicated in patients treated with ZYBAN® (bupropion hydrochloride) Sustained-Release Tablets; WELLBUTRIN® (bupropion hydrochloride), the immediate-release formulation; WELLBUTRIN SR, (bupropion hydrochloride), the sustained-release formulation; or any other medications that contain bupropion because the incidence of seizure is dose dependent.
WELLBUTRINÂ XL is contraindicated in patients with a current or prior diagnosis of bulimia or anorexia nervosa because of a higher incidence of seizures noted in patients treated for bulimia with the immediate-release formulation of bupropion.
WELLBUTRINÂ XL is contraindicated in patients undergoing abrupt discontinuation of alcohol or sedatives (including benzodiazepines).
  The concurrent administration of WELLBUTRIN XL and a monoamine oxidase (MAO) inhibitor is contraindicated. At least 14 days should elapse between discontinuation of an MAO inhibitor and initiation of treatment with WELLBUTRIN XL.
WELLBUTRINÂ XL is contraindicated in patients who have shown an allergic response to bupropion or the other ingredients that make up WELLBUTRINÂ XL.
Warnings
Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders: Patients with major depressive disorder (MDD), both adult and pediatric, may experience worsening of their depression and/or the emergence of suicidal ideation and behavior (suicidality) or unusual changes in behavior, whether or not they are taking antidepressant medications, and this risk may persist until significant remission occurs. Suicide is a known risk of depression and certain other psychiatric disorders, and these disorders themselves are the strongest predictors of suicide. There has been a long-standing concern, however, that antidepressants may have a role in inducing worsening of depression and the emergence of suicidality in certain patients during the early phases of treatment. Pooled analyses of short-term placebo-controlled trials of antidepressant drugs (SSRIs and others) showed that these drugs increase the risk of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults (ages 18 to 24) with major depressive disorder (MDD) and other psychiatric disorders. Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction with antidepressants compared to placebo in adults aged 65 and older.
The pooled analyses of placebo-controlled trials in children and adolescents with MDD, obsessive compulsive disorder (OCD), or other psychiatric disorders included a total of 24 short-term trials of 9 antidepressant drugs in over 4,400 patients. The pooled analyses of placebo-controlled trials in adults with MDD or other psychiatric disorders included a total of 295 short-term trials (median duration of 2 months) of 11 antidepressant drugs in over 77,000 patients. There was considerable variation in risk of suicidality among drugs, but a tendency toward an increase in the younger patients for almost all drugs studied. There were differences in absolute risk of suicidality across the different indications, with the highest incidence in MDD. The risk differences (drug vs placebo), however, were relatively stable within age strata and across indications. These risk differences (drug-placebo difference in the number of cases of suicidality per 1,000 patients treated) are provided in Table 1.
Table 1 Age Range Drug-Placebo Difference in Number of Cases of Suicidality per 1,000 Patients Treated Increases Compared to Placebo <18 14 additional cases 18-24 5 additional cases Decreases Compared to Placebo 25-64 1 fewer case ≥65 6 fewer cases
No suicides occurred in any of the pediatric trials. There were suicides in the adult trials, but the number was not sufficient to reach any conclusion about drug effect on suicide.
It is unknown whether the suicidality risk extends to longer-term use, i.e., beyond several months. However, there is substantial evidence from placebo-controlled maintenance trials in adults with depression that the use of antidepressants can delay the recurrence of depression.
All patients being treated with antidepressants for any indication should be monitored appropriately and observed closely for clinical worsening, suicidality, and unusual changes in behavior, especially during the initial few months of a course of drug therapy, or at times of dose changes, either increases or decreases.
The following symptoms, anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, and mania, have been reported in adult and pediatric patients being treated with antidepressants for major depressive disorder as well as for other indications, both psychiatric and nonpsychiatric. Although a causal link between the emergence of such symptoms and either the worsening of depression and/or the emergence of suicidal impulses has not been established, there is concern that such symptoms may represent precursors to emerging suicidality.
Consideration should be given to changing the therapeutic regimen, including possibly discontinuing the medication, in patients whose depression is persistently worse, or who are experiencing emergent suicidality or symptoms that might be precursors to worsening depression or suicidality, especially if these symptoms are severe, abrupt in onset, or were not part of the patient's presenting symptoms.
Families and caregivers of patients being treated with antidepressants for major depressive disorder or other indications, both psychiatric and nonpsychiatric, should be alerted about the need to monitor patients for the emergence of agitation, irritability, unusual changes in behavior, and the other symptoms described above, as well as the emergence of suicidality, and to report such symptoms immediately to healthcare providers. Such monitoring should include daily observation by families and caregivers. Prescriptions for WELLBUTRINÂ XL should be written for the smallest quantity of tablets consistent with good patient management, in order to reduce the risk of overdose.
Neuropsychiatric Symptoms and Suicide Risk in Smoking Cessation Treatment: WELLBUTRIN, WELLBUTRIN SR, and WELLBUTRIN XL are not approved for smoking cessation treatment, but bupropion under the name ZYBAN is approved for this use. Serious neuropsychiatric symptoms have been reported in patients taking bupropion for smoking cessation (see BOXED WARNING , ADVERSE REACTIONS ). These have included changes in mood (including depression and mania), psychosis, hallucinations, paranoia, delusions, homicidal ideation, hostility, agitation, aggression, anxiety, and panic, as well as suicidal ideation, suicide attempt, and completed suicide. Some reported cases may have been complicated by the symptoms of nicotine withdrawal in patients who stopped smoking. Depressed mood may be a symptom of nicotine withdrawal. Depression, rarely including suicidal ideation, has been reported in smokers undergoing a smoking cessation attempt without medication. However, some of these symptoms have occurred in patients taking bupropion who continued to smoke. When symptoms were reported, most were during bupropion treatment, but some were following discontinuation of bupropion therapy.
These events have occurred in patients with and without pre-existing psychiatric disease; some have experienced worsening of their psychiatric illnesses. All patients being treated with bupropion as part of smoking cessation treatment should be observed for neuropsychiatric symptoms or worsening of pre-existing psychiatric illness.
Patients with serious psychiatric illness such as schizophrenia, bipolar disorder, and major depressive disorder did not participate in the pre-marketing studies of ZYBAN.
Advise patients and caregivers that the patient using bupropion for smoking cessation should stop taking bupropion and contact a healthcare provider immediately if agitation, depressed mood, or changes in behavior or thinking that are not typical for the patient are observed, or if the patient develops suicidal ideation or suicidal behavior. In many post-marketing cases, resolution of symptoms after discontinuation of ZYBAN was reported, although in some cases the symptoms persisted, therefore, ongoing monitoring and supportive care should be provided until symptoms resolve.
The risks of using bupropion for smoking cessation should be weighed against the benefits of its use. ZYBAN has been demonstrated to increase the likelihood of abstinence from smoking for as long as six months compared to treatment with placebo. The health benefits of quitting smoking are immediate and substantial.
Screening Patients for Bipolar Disorder: A major depressive episode may be the initial presentation of bipolar disorder. It is generally believed (though not established in controlled trials) that treating such an episode with an antidepressant alone may increase the likelihood of precipitation of a mixed/manic episode in patients at risk for bipolar disorder. Whether any of the symptoms described above represent such a conversion is unknown. However, prior to initiating treatment with an antidepressant, patients with depressive symptoms should be adequately screened to determine if they are at risk for bipolar disorder; such screening should include a detailed psychiatric history, including a family history of suicide, bipolar disorder, and depression. It should be noted that WELLBUTRINÂ XL is not approved for use in treating bipolar depression.
Bupropion-Containing Products: Patients should be made aware that WELLBUTRINÂ XL contains the same active ingredient found in ZYBAN, used as an aid to smoking cessation treatment, and that WELLBUTRINÂ XL should not be used in combination with ZYBAN, or any other medications that contain bupropion, such as WELLBUTRINÂ SR (bupropion hydrochloride), the sustained-release formulation or WELLBUTRIN (bupropion hydrochloride), the immediate-release formulation.
Seizures: Bupropion is associated with a dose-related risk of seizures. The risk of seizures is also related to patient factors, clinical situations, and concomitant medications, which must be considered in selection of patients for therapy with WELLBUTRINÂ XL. WELLBUTRINÂ XL should be discontinued and not restarted in patients who experience a seizure while on treatment.
As WELLBUTRINÂ XL is bioequivalent to both the immediate-release formulation of bupropion and to the sustained-release formulation of bupropion, the seizure incidence with WELLBUTRINÂ XL, while not formally evaluated in clinical trials, may be similar to that presented below for the immediate-release and sustained-release formulations of bupropion.
- Dose: At doses up to 300Â mg/day of the sustained-release formulation of bupropion (WELLBUTRINÂ SR), the incidence of seizure is approximately 0.1% (1/1,000).
Data for the immediate-release formulation of bupropion revealed a seizure incidence of approximately 0.4% (i.e., 13 of 3,200 patients followed prospectively) in patients treated at doses in a range of 300 to 450Â mg/day. This seizure incidence (0.4%) may exceed that of some other marketed antidepressants.
Additional data accumulated for the immediate-release formulation of bupropion suggested that the estimated seizure incidence increases almost tenfold between 450 and 600Â mg/day. The 600Â mg dose is twice the usual adult dose and one and one-third the maximum recommended daily dose (450Â mg) of WELLBUTRINÂ XL. This disproportionate increase in seizure incidence with dose incrementation calls for caution in dosing.
- Patient factors: Predisposing factors that may increase the risk of seizure with bupropion use include history of head trauma or prior seizure, central nervous system (CNS) tumor, the presence of severe hepatic cirrhosis, and concomitant medications that lower seizure threshold.
- Clinical situations: Circumstances associated with an increased seizure risk include, among others, excessive use of alcohol or sedatives (including benzodiazepines); addiction to opiates, cocaine, or stimulants; use of over-the-counter stimulants and anorectics; and diabetes treated with oral hypoglycemics or insulin.
- Concomitant medications: Many medications (e.g., antipsychotics, antidepressants, theophylline, systemic steroids) are known to lower seizure threshold.
Recommendations for Reducing the Risk of Seizure: Retrospective analysis of clinical experience gained during the development of bupropion suggests that the risk of seizure may be minimized if
- the total daily dose of WELLBUTRINÂ XL does
not exceed 450Â mg, - the rate of incrementation of dose is gradual.
WELLBUTRINÂ XL should be administered with extreme caution to patients with a history of seizure, cranial trauma, or other predisposition(s) toward seizure, or patients treated with other agents (e.g., antipsychotics, other antidepressants, theophylline, systemic steroids, etc.) that lower seizure threshold.
Hepatic Impairment: WELLBUTRIN XL should be used with extreme caution in patients with severe hepatic cirrhosis. In these patients a reduced frequency and/or dose is required as peak bupropion as well as AUC levels are substantially increased and accumulation is likely to occur in such patients to a greater extent than usual. The dose should not exceed 150 mg every other day in these patients (see CLINICAL PHARMACOLOGY, PRECAUTIONS, and DOSAGE AND ADMINISTRATION).
Potential for Hepatotoxicity: In rats receiving large doses of bupropion chronically, there was an increase in incidence of hepatic hyperplastic nodules and hepatocellular hypertrophy. In dogs receiving large doses of bupropion chronically, various histologic changes were seen in the liver, and laboratory tests suggesting mild hepatocellular injury were noted.
Precautions
GENERAL PRECAUTIONS SECTION
General: Agitation and Insomnia: Increased restlessness, agitation, anxiety, and insomnia, especially shortly after initiation of treatment, have been associated with treatment with bupropion. In 3Â placebo-controlled clinical trials of seasonal affective disorder with WELLBUTRINÂ XL, the incidence of agitation, anxiety, and insomnia are shown in Table 2.
Table 2. Incidence of Agitation, Anxiety, and Insomnia in Placebo-Controlled Trials of WELLBUTRINÂ XL for Seasonal Affective Disorder
Adverse Event Term
WELLBUTRINÂ XL
150 to 300Â mg/day
(n = 537)
Placebo
(n = 511)
Agitation
2%
<1%
Anxiety
7%
5%
Insomnia
20%
13%
Patients in placebo-controlled trials of major depressive disorder with WELLBUTRINÂ SR, the sustained-release formulation of bupropion, experienced agitation, anxiety, and insomnia as shown in Table 3.
Table 3. Incidence of Agitation, Anxiety, and Insomnia in Placebo-Controlled Trials of WELLBUTRIN SR for Major Depressive Disorder
Adverse Event Term
WELLBUTRINÂ SR
300Â mg/day
(n = 376)
WELLBUTRINÂ SR
400Â mg/day
(n = 114)
Placebo
(n = 385)
Agitation
3%
9%
2%
Anxiety
5%
6%
3%
Insomnia
11%
16%
6%
In clinical studies of major depressive disorder, these symptoms were sometimes of sufficient magnitude to require treatment with sedative/hypnotic drugs.
Symptoms in these studies were sufficiently severe to require discontinuation of treatment in 1% and 2.6% of patients treated with 300 and 400Â mg/day, respectively, of bupropion sustained-release tablets and 0.8% of patients treated with placebo.
Psychosis, Confusion, and Other Neuropsychiatric Phenomena: Depressed patients treated with bupropion have been reported to show a variety of neuropsychiatric signs and symptoms, including delusions, hallucinations, psychosis, concentration disturbance, paranoia, and confusion. In some cases, these symptoms abated upon dose reduction and/or withdrawal of treatment.
Activation of Psychosis and/or Mania: Antidepressants can precipitate manic episodes in bipolar disorder patients during the depressed phase of their illness and may activate latent psychosis in other susceptible patients. WELLBUTRINÂ XL is expected to pose similar risks.
Altered Appetite and Weight: In 3 placebo-controlled clinical trials of seasonal affective disorder with WELLBUTRIN XL, the percentage of patients with weight gain or weight loss are shown in Table 4.
Table 4. Incidence of Weight Gain and Weight Loss in Placebo-Controlled Trials of WELLBUTRIN XL for Seasonal Affective Disorder
Weight Change
WELLBUTRINÂ XL
150 to 300Â mg/day
(n = 537)
Placebo
(n = 511)
Gained >5 lbs
11%
21%
Lost >5 lbs
23%
11%
In placebo-controlled studies of major depressive disorder using WELLBUTRINÂ SR, the sustained-release formulation of bupropion, patients experienced weight gain or weight loss as shown in Table 5.
Table 5. Incidence of Weight Gain and Weight Loss in Placebo-Controlled Trials of WELLBUTRIN SR for Major Depressive Disorder
Weight Change
WELLBUTRINÂ SR
300 mg/day
(n = 339)
WELLBUTRINÂ SR
400 mg/day
(n = 112)
Placebo
(n = 347)
Gained >5 lbs
3%
2%
4%
Lost >5 lbs
14%
19%
6%
In studies conducted with the immediate-release formulation of bupropion, 35% of patients receiving tricyclic antidepressants gained weight, compared to 9% of patients treated with the immediate-release formulation of bupropion. If weight loss is a major presenting sign of a patient's depressive illness, the anorectic and/or weight-reducing potential of WELLBUTRINÂ XL should be considered.
Allergic Reactions: Anaphylactoid/anaphylactic reactions characterized by symptoms such as pruritus, urticaria, angioedema, and dyspnea requiring medical treatment have been reported in clinical trials with bupropion. In addition, there have been rare spontaneous postmarketing reports of erythema multiforme, Stevens-Johnson syndrome, and anaphylactic shock associated with bupropion. A patient should stop taking WELLBUTRINÂ XL and consult a doctor if experiencing allergic or anaphylactoid/anaphylactic reactions (e.g., skin rash, pruritus, hives, chest pain, edema, and shortness of breath) during treatment.
Arthralgia, myalgia, and fever with rash and other symptoms suggestive of delayed hypersensitivity have been reported in association with bupropion. These symptoms may resemble serum sickness.
Cardiovascular Effect s: In clinical practice, hypertension, in some cases severe, requiring acute treatment, has been reported in patients receiving bupropion alone and in combination with nicotine replacement therapy. These events have been observed in both patients with and without evidence of preexisting hypertension.
Data from a comparative study of the sustained-release formulation of bupropion (ZYBAN® Sustained-Release Tablets), nicotine transdermal system (NTS), the combination of sustained-release bupropion plus NTS, and placebo as an aid to smoking cessation suggest a higher incidence of treatment-emergent hypertension in patients treated with the combination of sustained-release bupropion and NTS. In this study, 6.1% of patients treated with the combination of sustained-release bupropion and NTS had treatment-emergent hypertension compared to 2.5%, 1.6%, and 3.1% of patients treated with sustained-release bupropion, NTS, and placebo, respectively. The majority of these patients had evidence of preexisting hypertension. Three patients (1.2%) treated with the combination of ZYBAN and NTS and 1 patient (0.4%) treated with NTS had study medication discontinued due to hypertension compared to none of the patients treated with ZYBAN or placebo. Monitoring of blood pressure is recommended in patients who receive the combination of bupropion and nicotine replacement.
There is no clinical experience establishing the safety of WELLBUTRINÂ XL in patients with a recent history of myocardial infarction or unstable heart disease. Therefore, care should be exercised if it is used in these groups. Bupropion was well tolerated in depressed patients who had previously developed orthostatic hypotension while receiving tricyclic antidepressants, and was also generally well tolerated in a group of 36 depressed inpatients with stable congestive heart failure (CHF). However, bupropion was associated with a rise in supine blood pressure in the study of patients with CHF, resulting in discontinuation of treatment in 2Â patients for exacerbation of baseline hypertension.
Hepatic Impairment: WELLBUTRINÂ XL should be used with extreme caution in patients with severe hepatic cirrhosis. In these patients, a reduced frequency and/or dose is required. WELLBUTRINÂ XL should be used with caution in patients with hepatic impairment (including mild-to-moderate hepatic cirrhosis) and reduced frequency and/or dose should be considered in patients with mild-to-moderate hepatic cirrhosis.
All patients with hepatic impairment should be closely monitored for possible adverse effects that could indicate high drug and metabolite levels (see CLINICAL PHARMACOLOGY , WARNINGS , and DOSAGE AND ADMINISTRATION ).
Renal Impairment: There is limited information on the pharmacokinetics of bupropion in patients with renal impairment. An inter-study comparison between normal subjects and patients with end-stage renal failure demonstrated that the parent drug Cmax and AUC values were comparable in the 2 groups, whereas the hydroxybupropion and threohydrobupropion metabolites had a 2.3– and 2.8-fold increase, respectively, in AUC for patients with end-stage renal failure. A second study, comparing normal subjects and patients with moderate-to-severe renal impairment (GFR 30.9 ± 10.8 mL/min) showed that exposure to a single 150 mg dose of sustained-release bupropion was approximately 2-fold higher in patients with impaired renal function while levels of the hydroxybupropion and threo/erythrohydrobupropion (combined) metabolites were similar in the 2 groups. Bupropion is extensively metabolized in the liver to active metabolites, which are further metabolized and subsequently excreted by the kidneys. WELLBUTRIN XL should be used with caution in patients with renal impairment and a reduced frequency and/or dose should be considered as bupropion and the metabolites of bupropion may accumulate in such patients to a greater extent than usual. The patient should be closely monitored for possible adverse effects that could indicate high drug or metabolite levels.
INFORMATION FOR PATIENTS SECTION
Information for Patients: Prescribers or other health professionals should inform patients, their families, and their caregivers about the benefits and risks associated with treatment with WELLBUTRINÂ XL and should counsel them in its appropriate use. A patient Medication Guide about "Antidepressant Medicines, Depression and Other Serious Mental Illnesses, and Suicidal Thoughts or Actions", "Quitting Smoking, Quit-Smoking Medications, Changes in Thinking and Behavior, Depression, and Suicidal Thoughts or Actions", and "What Other Important Information Should I Know About WELLBUTRINÂ XL?" is available for WELLBUTRINÂ XL. The prescriber or health professional should instruct patients, their families, and their caregivers to read the Medication Guide and should assist them in understanding its contents. Patients should be given the opportunity to discuss the contents of the Medication Guide and to obtain answers to any questions they may have. The complete text of the Medication Guide is reprinted at the end of this document.
Patients should be advised of the following issues and asked to alert their prescriber if these occur while taking WELLBUTRINÂ XL.
Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders: Patients, their families, and their caregivers should be encouraged to be alert to the emergence of anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, mania, other unusual changes in behavior, worsening of depression, and suicidal ideation, especially early during antidepressant treatment and when the dose is adjusted up or down. Families and caregivers of patients should be advised to look for the emergence of such symptoms on a day-to-day basis, since changes may be abrupt. Such symptoms should be reported to the patient's prescriber or health professional, especially if they are severe, abrupt in onset, or were not part of the patient's presenting symptoms. Symptoms such as these may be associated with an increased risk for suicidal thinking and behavior and indicate a need for very close monitoring and possibly changes in the medication.
Neuropsychiatric Symptoms and Suicide Risk in Smoking Cessation Treatment: Although WELLBUTRIN XL is not indicated for smoking cessation treatment, it contains the same active ingredient as ZYBAN which is approved for this use. Patients should be informed that quitting smoking, with or without ZYBAN, may be associated with nicotine withdrawal symptoms (including depression or agitation), or exacerbation of pre-existing psychiatric illness. Furthermore some patients have experienced changes in mood (including depression and mania), psychosis, hallucinations, paranoia, delusions, homicidal ideation, aggression, anxiety, and panic, as well as suicidal ideation, suicide attempt, and completed suicide when attempting to quit smoking while taking ZYBAN. If patients develop agitation, hostility, depressed mood, or changes in thinking or behavior that are not typical for them, or if patients develop suicidal ideation or behavior, they should be urged to report these symptoms to their healthcare provider immediately
Bupropion-Containing Products: Patients should be made aware that WELLBUTRINÂ XL contains the same active ingredient found in ZYBAN, used as an aid to smoking cessation treatment, and that WELLBUTRINÂ XL should not be used in combination with ZYBAN or any other medications that contain bupropion hydrochloride (such as WELLBUTRINÂ SR, the sustained-release formulation, and WELLBUTRIN, the immediate-release formulation).
Patients should be told that WELLBUTRINÂ XL should be discontinued and not restarted if they experience a seizure while on treatment.
Patients should be told that any CNS-active drug like WELLBUTRINÂ XL may impair their ability to perform tasks requiring judgment or motor and cognitive skills. Consequently, until they are reasonably certain that WELLBUTRINÂ XL does not adversely affect their performance, they should refrain from driving an automobile or operating complex, hazardous machinery.
Patients should be told that the excessive use or abrupt discontinuation of alcohol or sedatives (including benzodiazepines) may alter the seizure threshold. Some patients have reported lower alcohol tolerance during treatment with WELLBUTRINÂ XL. Patients should be advised that the consumption of alcohol should be minimized or avoided.
Patients should be advised to inform their physicians if they are taking or plan to take any prescription or over-the-counter drugs. Concern is warranted because WELLBUTRINÂ XL and other drugs may affect each other's metabolism.
Patients should be advised to notify their physicians if they become pregnant or intend to become pregnant during therapy.
Patients should be advised to swallow WELLBUTRINÂ XL whole so that the release rate is not altered. Do not chew, divide, or crush tablets, as this may lead to an increased risk of adverse effects, including seizures.
Patients should be advised that they may notice in their stool something that looks like a tablet. This is normal. The medication in WELLBUTRINÂ XL is contained in a non-absorbable shell that has been specially designed to slowly release drug in the body. When this process is completed, the empty shell is eliminated from the body.
LABORATORY TESTS SECTION
Laboratory Tests: There are no specific laboratory tests recommended.
DRUG INTERACTIONS SECTION
Drug Interactions: Few systemic data have been collected on the metabolism of bupropion following concomitant administration with other drugs or, alternatively, the effect of concomitant administration of bupropion on the metabolism of other drugs.
Because bupropion is extensively metabolized, the coadministration of other drugs may affect its clinical activity. In vitro studies indicate that bupropion is primarily metabolized to hydroxybupropion by the CYP2B6 isoenzyme. Therefore, the potential exists for a drug interaction between WELLBUTRIN XL and drugs that are substrates of or inhibitors /inducers of the CYP2B6 isoenzyme (e.g., orphenadrine, thiotepa, cyclophosphamide, ticlopidine, and clopidogrel). In addition, in vitro studies suggest that paroxetine, sertraline, norfluoxetine, and fluvoxamine as well as nelfinavir and efavirenz inhibit the hydroxylation of bupropion. No clinical studies have been performed to evaluate this finding. The threohydrobupropion metabolite of bupropion does not appear to be produced by the cytochrome P450 isoenzymes. The effects of concomitant administration of cimetidine on the pharmacokinetics of bupropion and its active metabolites were studied in 24 healthy young male volunteers. Following oral administration of two 150-mg tablets of the sustained-release formulation of bupropion with and without 800 mg of cimetidine, the pharmacokinetics of bupropion and hydroxybupropion were unaffected. However, there were 16% and 32% increases in the AUC and Cmax, respectively, of the combined moieties of threohydrobupropion and erythrohydrobupropion.
In a series of studies in healthy volunteers, ritonavir (100 mg twice daily or 600 mg twice daily) or ritonavir 100 mg plus lopinavir (KALETRA) 400 mg twice daily reduced the exposure of bupropion and its major metabolites in a dose dependent manner by approximately 20% to 80%. Similarly, efavirenz 600mg once daily for 2 weeks reduced the exposure of bupropion by approximately 55%. This effect of ritonavir, KALETRA, and efavirenz is thought to be due to the induction of bupropion metabolism. Patients receiving any of these drugs with bupropion may need increased doses of bupropion, but the maximum recommended dose of bupropion should not be exceeded (see CLINICAL PHARMACOLOGY: Metabolism).
While not systematically studied, certain drugs may induce the metabolism of bupropion (e.g., carbamazepine, phenobarbital, phenytoin).
Multiple oral doses of bupropion had no statistically significant effects on the single dose pharmacokinetics of lamotrigine in 12 healthy volunteers.
Animal data indicated that bupropion may be an inducer of drug-metabolizing enzymes in humans. In one study, following chronic administration of bupropion, 100Â mg 3Â times daily to 8Â healthy male volunteers for 14Â days, there was no evidence of induction of its own metabolism. Nevertheless, there may be the potential for clinically important alterations of blood levels of coadministered drugs.
Drugs Metabolized By Cytochrome P450IID6 (CYP2D6): Many drugs, including most antidepressants (SSRIs, many tricyclics), beta-blockers, antiarrhythmics, and antipsychotics are metabolized by the CYP2D6 isoenzyme. Although bupropion is not metabolized by this isoenzyme, bupropion and hydroxybupropion are inhibitors of CYP2D6 isoenzyme in vitro. In a study of 15Â male subjects (ages 19 to 35Â years) who were extensive metabolizers of the CYP2D6 isoenzyme, daily doses of bupropion given as 150Â mg twice daily followed by a single dose of 50Â mg desipramine increased the Cmax, AUC, and t1/2 of desipramine by an average of approximately 2-, 5-, and 2-fold, respectively. The effect was present for at least 7Â days after the last dose of bupropion. Concomitant use of bupropion with other drugs metabolized by CYP2D6 has not been formally studied.
Therefore, coadministration of bupropion with drugs that are metabolized by CYP2D6 isoenzyme including certain antidepressants (e.g., nortriptyline, imipramine, desipramine, paroxetine, fluoxetine, sertraline), antipsychotics (e.g., haloperidol, risperidone, thioridazine), beta-blockers (e.g., metoprolol), and Type 1C antiarrhythmics (e.g., propafenone, flecainide), should be approached with caution and should be initiated at the lower end of the dose range of the concomitant medication. If bupropion is added to the treatment regimen of a patient already receiving a drug metabolized by CYP2D6, the need to decrease the dose of the original medication should be considered, particularly for those concomitant medications with a narrow therapeutic index.
Drugs which require metabolic activation by CYP2D6 in order to be effective (e.g., tamoxifen) theorectically could have reduced efficacy when administered concomitantly with inhibitors of CYP2D6 such as bupropion.
Although citalopram is not primarily metabolized by CYP2D6, in one study bupropion increased the Cmax and AUC of citalopram by 30% and 40%, respectively. Citalopram did not affect the pharmacokinetics of bupropion and its three metabolites.
MAO Inhibitors: Studies in animals demonstrate that the acute toxicity of bupropion is enhanced by the MAO inhibitor phenelzine (see CONTRAINDICATIONS ).
Levodopa and Amantadine: Limited clinical data suggest a higher incidence of adverse experiences in patients receiving bupropion concurrently with either levodopa or amantadine. Administration of WELLBUTRINÂ XL to patients receiving either levodopa or amantadine concurrently should be undertaken with caution, using small initial doses and gradual dose increases.
Drugs That Lower Seizure Threshold: Concurrent administration of WELLBUTRINÂ XL and agents (e.g., antipsychotics, other antidepressants, theophylline, systemic steroids, etc.) that lower seizure threshold should be undertaken only with extreme caution (see WARNINGS ). Low initial dosing and gradual dose increases should be employed.
Nicotine Transdermal System: (see PRECAUTIONS: Cardiovascular Effects ).
Alcohol: In postmarketing experience, there have been rare reports of adverse neuropsychiatric events or reduced alcohol tolerance in patients who were drinking alcohol during treatment with bupropion. The consumption of alcohol during treatment with WELLBUTRIN XL should be minimized or avoided (also see CONTRAINDICATIONS ).
Drug-Laboratory Test Interactions: False-positive urine immunoassay screening tests for amphetamines have been reported in patients taking bupropion. This is due to lack of specificity of some screening tests. False-positive test results may result even following discontinuation of bupropion therapy. Confirmatory tests, such as gas chromatography/mass spectrometry, will distinguish bupropion from amphetamines.
CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION
Carcinogenesis, Mutagenesis, Impairment of Fertility: Lifetime carcinogenicity studies were performed in rats and mice at doses up to 300 and 150Â mg/kg/day, respectively. These doses are approximately 7 and 2 times the maximum recommended human dose (MRHD), respectively, on a mg/m2 basis. In the rat study there was an increase in nodular proliferative lesions of the liver at doses of 100 to 300Â mg/kg/day (approximately 2 to 7 times the MRHD on a mg/m2 basis); lower doses were not tested. The question of whether or not such lesions may be precursors of neoplasms of the liver is currently unresolved. Similar liver lesions were not seen in the mouse study, and no increase in malignant tumors of the liver and other organs was seen in either study.
Bupropion produced a positive response (2 to 3Â times control mutation rate) in 2Â of 5Â strains in the Ames bacterial mutagenicity test and an increase in chromosomal aberrations in 1Â of 3Â in vivo rat bone marrow cytogenetic studies.
A fertility study in rats at doses up to 300Â mg/kg/day revealed no evidence of impaired fertility.
Pregnancy Section
Teratogenic Effects Section
Pregnancy: Teratogenic Effects: Pregnancy Category C. In studies conducted in rats and rabbits, bupropion was administered orally at doses up to 450 and 150 mg/kg/day, respectively (approximately 11 and 7 times the maximum recommended human dose [MRHD], respectively, on a mg/m2 basis), during the period of organogenesis. No clear evidence of teratogenic activity was found in either species; however, in rabbits, slightly increased incidences of fetal malformations and skeletal variations were observed at the lowest dose tested (25 mg/kg/day, approximately equal to the MRHD on a mg/m2 basis) and greater. Decreased fetal weights were seen at 50 mg/kg and greater.
When rats were administered bupropion at oral doses of up to 300 mg/kg/day (approximately 7 times the MRHD on a mg/m2 basis) prior to mating and throughout pregnancy and lactation, there were no apparent adverse effects on offspring development.
One study has been conducted in pregnant women. This retrospective, managed-care database study assessed the risk of congenital malformations overall, and cardiovascular malformations specifically, following exposure to bupropion in the first trimester compared to the risk of these malformations following exposure to other antidepressants in the first trimester and bupropion outside of the first trimester. This study included 7,005 infants with antidepressant exposure during pregnancy, 1,213 of whom were exposed to bupropion in the first trimester. The study showed no greater risk for congenital malformations overall, or cardiovascular malformations specifically, following first trimester bupropion exposure compared to exposure to all other antidepressants in the first trimester, or bupropion outside of the first trimester. The results of this study have not been corroborated. WELLBUTRINÂ XL should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
LABOR & DELIVERY SECTION
Labor and Delivery: The effect of WELLBUTRINÂ XL Tablets on labor and delivery in humans is unknown.
NURSING MOTHERS SECTION
Nursing Mothers: Like many other drugs, bupropion and its metabolites are secreted in human milk. Because of the potential for serious adverse reactions in nursing infants from WELLBUTRINÂ XL, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
PEDIATRIC USE SECTION
Pediatric Use: Safety and effectiveness in the pediatric population have not been established (see BOX WARNING and WARNINGS: Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders). Anyone considering the use of WELLBUTRIN XL in a child or adolescent must balance the potential risks with the clinical need.
GERIATRIC USE SECTION
Geriatric Use: Of the approximately 6,000 patients who participated in clinical trials with bupropion sustained-release tablets (depression and smoking cessation studies), 275 were ≥65 years old and 47 were ≥75 years old. In addition, several hundred patients 65 and over participated in clinical trials using the immediate-release formulation of bupropion (depression studies). No overall differences in safety or effectiveness were observed between these subjects and younger subjects. Reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
A single-dose pharmacokinetic study demonstrated that the disposition of bupropion and its metabolites in elderly subjects was similar to that of younger subjects; however, another pharmacokinetic study, single and multiple dose, has suggested that the elderly are at increased risk for accumulation of bupropion and its metabolites (see CLINICAL PHARMACOLOGY ).
Bupropion is extensively metabolized in the liver to active metabolites, which are further metabolized and excreted by the kidneys. The risk of toxic reaction to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function (see PRECAUTIONS: Renal Impairment and DOSAGE AND ADMINISTRATION ).
Adverse Reactions Section
ADVERSE REACTIONS (See also WARNINGS and PRECAUTIONS .)
Major Depressive Disorder: WELLBUTRINÂ XL has been demonstrated to have similar bioavailability both to the immediate-release formulation of bupropion and to the sustained-release formulation of bupropion (see CLINICAL PHARMACOLOGY ). The information included under this subsection is based primarily on data from controlled clinical trials with WELLBUTRINÂ SR, the sustained-release formulation of bupropion.
Adverse Events Leading to Discontinuation of Treatment With WELLBUTRIN or WELLBUTRIN SR: In placebo-controlled clinical trials, 9% and 11% of patients treated with 300 and 400Â mg/day, respectively, of the sustained-release formulation of bupropion and 4% of patients treated with placebo discontinued treatment due to adverse events. The specific adverse events in these trials that led to discontinuation in at least 1% of patients treated with either 300Â mg/day or 400Â mg/day of WELLBUTRINÂ SR, the sustained-release formulation of bupropion, and at a rate at least twice the placebo rate are uled in Table 6.
Table 6. Treatment Discontinuations Due to Adverse Events in Placebo-Controlled Trials for Major Depressive Disorder
Adverse Event Term
WELLBUTRINÂ SR
300 mg/day
(n = 376)
WELLBUTRINÂ SR
400 mg/day
(n = 114)
Placebo
(n = 385)
Rash
2.4%
0.9%
0.0%
Nausea
0.8%
1.8%
0.3%
Agitation
0.3%
1.8%
0.3%
Migraine
0.0%
1.8%
0.3%
In clinical trials with the immediate-release formulation of bupropion, 10% of patients and volunteers discontinued due to an adverse event. Events resulting in discontinuation, in addition to those uled above for the sustained-release formulation of bupropion, include vomiting, seizures, and sleep disturbances.
Adverse Events Occurring at an Incidence of 1% or More Among Patients Treated With WELLBUTRIN or WELLBUTRIN SR: Table 7 enumerates treatment-emergent adverse events that occurred among patients treated with 300 and 400 mg/day of the sustained-release formulation of bupropion and with placebo in controlled trials. Events that occurred in either the 300- or 400-mg/day group at an incidence of 1% or more and were more frequent than in the placebo group are included. Reported adverse events were classified using a COSTART-based Dictionary.
Accurate estimates of the incidence of adverse events associated with the use of any drug are difficult to obtain. Estimates are influenced by drug dose, detection technique, setting, physician judgments, etc. The figures cited cannot be used to predict precisely the incidence of untoward events in the course of usual medical practice where patient characteristics and other factors differ from those that prevailed in the clinical trials. These incidence figures also cannot be compared with those obtained from other clinical studies involving related drug products as each group of drug trials is conducted under a different set of conditions.
Finally, it is important to emphasize that the tabulation does not reflect the relative severity and/or clinical importance of the events. A better perspective on the serious adverse events associated with the use of bupropion is provided in the WARNINGS and PRECAUTIONS sections.
Table 7. Treatment-Emergent Adverse Events in Placebo-Controlled Trials Adverse events that occurred in at least 1% of patients treated with either 300 or 400 mg/day of the sustained-release formulation of bupropion, but equally or more frequently in the placebo group, were: abnormal dreams, accidental injury, acne, appetite increased, back pain, bronchitis, dysmenorrhea, dyspepsia, flatulence, flu syndrome, hypertension, neck pain, respiratory disorder, rhinitis, and tooth disorder. for Major Depressive Disorder— Hyphen denotes adverse events occurring in greater than 0 but less than 0.5% of patients.
Body System/
Adverse Event
WELLBUTRIN SR
300Â mg/day
(n = 376)
WELLBUTRIN SR
400Â mg/day
(n = 114)
Placebo
(n = 385)
Body (General)
  Headache
26%
25%
23%
  Infection
8%
9%
6%
  Abdominal pain
3%
9%
2%
  Asthenia
2%
4%
2%
  Chest pain
3%
4%
1%
  Pain
2%
3%
2%
  Fever
1%
2%
—
Cardiovascular
  Palpitation
2%
6%
2%
  Flushing
1%
4%
—
  Migraine
1%
4%
1%
  Hot flashes
1%
3%
1%
Digestive
  Dry mouth
17%
24%
7%
  Nausea
13%
18%
8%
  Constipation
10%
5%
7%
  Diarrhea
5%
7%
6%
  Anorexia
5%
3%
2%
  Vomiting
4%
2%
2%
  Dysphagia
0%
2%
0%
Musculoskeletal
  Myalgia
2%
6%
3%
  Arthralgia
1%
4%
1%
  Arthritis
0%
2%
0%
  Twitch
1%
2%
—
Nervous system
  Insomnia
11%
16%
6%
  Dizziness
7%
11%
5%
  Agitation
3%
9%
2%
  Anxiety
5%
6%
3%
  Tremor
6%
3%
1%
  Nervousness
5%
3%
3%
  Somnolence
2%
3%
2%
  Irritability
3%
2%
2%
  Memory decreased
—
3%
1%
  Paresthesia
1%
2%
1%
  Central nervous system stimulation
2%
1%
1%
Respiratory
  Pharyngitis
3%
11%
2%
  Sinusitis
3%
1%
2%
  Increased cough
1%
2%
1%
Skin
  Sweating
6%
5%
2%
  Rash
5%
4%
1%
  Pruritus
2%
4%
2%
  Urticaria
2%
1%
0%
Special senses
  Tinnitus
6%
6%
2%
  Taste perversion
2%
4%
—
  Blurred vision or diplopia
3%
2%
2%
Urogenital
  Urinary frequency
2%
5%
2%
  Urinary urgency
—
2%
0%
  Vaginal hemorrhageIncidence based on the number of female patients.
0%
2%
—
  Urinary tract infection
1%
0%
—
Additional events to those uled in Table 7 that occurred at an incidence of at least 1% in controlled clinical trials of the immediate-release formulation of bupropion (300 to 600 mg/day) and that were numerically more frequent than placebo were: cardiac arrhythmias (5% vs 4%), hypertension (4% vs 2%), hypotension (3% vs 2%), tachycardia (11% vs 9%), appetite increase (4% vs 2%), dyspepsia (3% vs 2%), menstrual complaints (5% vs 1%), akathisia (2% vs 1%), impaired sleep quality (4% vs 2%), sensory disturbance (4% vs 3%), confusion (8% vs 5%), decreased libido (3% vs 2%), hostility (6% vs 4%), auditory disturbance (5% vs 3%), and gustatory disturbance (3% vs 1%).
Incidence of Commonly Observed Adverse Events in Controlled Clinical Trials: Adverse events from Table 7 occurring in at least 5% of patients treated with the sustained-release formulation of bupropion and at a rate at least twice the placebo rate are uled below for the 300- and 400-mg/day dose groups.
300 mg/day of WELLBUTRIN SR: Anorexia, dry mouth, rash, sweating, tinnitus, and tremor.
400 mg/day of WELLBUTRIN SR: Abdominal pain, agitation, anxiety, dizziness, dry mouth, insomnia, myalgia, nausea, palpitation, pharyngitis, sweating, tinnitus, and urinary frequency.
Seasonal Affective Disorder: Adverse Events Leading to Discontinuation of Treatment With WELLBUTRIN XL: In placebo-controlled clinical trials, 9% of patients treated with WELLBUTRINÂ XL and 5% of patients treated with placebo discontinued treatment due to adverse events. The adverse events in these trials that led to discontinuation in at least 1% of patients treated with WELLBUTRINÂ XL and at a rate numerically greater than the placebo rate are insomnia (2% vs<1%) and headache (1% vs <1%).
Adverse Events Occurring at an Incidence of 2% or More Among Patients Treated With WELLBUTRIN XL: Table 8 enumerates treatment-emergent adverse events that occurred among patients treated with WELLBUTRIN XL for up to approximately 6 months in 3 placebo-controlled trials. Events that occurred at an incidence of 2% or more and were more frequent than in the placebo group are included. Reported adverse events were classified using a MedDRA-based Dictionary.
Accurate estimates of the incidence of adverse events associated with the use of any drug are difficult to obtain. Estimates are influenced by drug dose, detection technique, setting, physician judgments, etc. The figures cited cannot be used to predict precisely the incidence of untoward events in the course of usual medical practice where patient characteristics and other factors differ from those that prevailed in the clinical trials. These incidence figures also cannot be compared with those obtained from other clinical studies involving related drug products as each group of drug trials is conducted under a different set of conditions; e.g., different patient populations, different treatment durations.
Finally, it is important to emphasize that the tabulation does not reflect the relative severity and/or clinical importance of the events. A better perspective on the serious adverse events associated with the use of bupropion is provided in the WARNINGS and PRECAUTIONS sections.
Table 8. Treatment-Emergent Adverse Events Adverse events that occurred in at least 2% of patients treated with WELLBUTRINÂ XL, but equally or more frequently in the placebo group, were: abdominal pain upper, arthralgia, back pain, diarrhea, dyspepsia, fatigue, gastroenteritis viral, hyperhidrosis, influenza, irritability, migraine, nasal congestion, neck pain, palpitations, pharyngolaryngeal pain, sinus congestion. in Placebo-Controlled Trials of Seasonal Affective Disorder
System Organ Class/
Preferred Term
WELLBUTRINÂ XL
(n = 537)
Placebo
(n = 511)
Gastrointestinal Disorder
  Dry Mouth
26%
15%
  Nausea
13%
8%
  Constipation
9%
2%
  Flatulence
6%
3%
  Abdominal pain
2%
<1%
Nervous System Disorders
  Headache
34%
26%
  Dizziness
6%
5%
  Tremor
3%
<1%
Infections and Infestations
  Nasopharyngitis
13%
12%
  Upper respiratory tract infection
9%
8%
  Sinusitis
5%
4%
Psychiatric Disorders
  Insomnia
20%
13%
  Anxiety
7%
5%
  Abnormal dreams
3%
2%
  Agitation
2%
<1%
Musculoskeletal and Connective Tissue Disorders
  Myalgia
3%
2%
  Pain in extremity
3%
2%
Respiratory, Thoracic and Mediastinal Disorders
  Cough
4%
3%
General Disorders and Administration Site Conditions
  Feeling jittery
3%
2%
Skin and Subcutaneous Tissue Disorders
  Rash
3%
2%
Metabolism and Nutrition Disorders
  Decreased appetite
4%
1%
Reproductive System and Breast Disorders
  Dysmenorrhea
2%
<1%
Ear and Labyrinth Disorders
  Tinnitus
3%
<1%
Vascular Disorders
  Hypertension
2%
0%
Incidence of Commonly Observed Adverse Events in Controlled Clinical Trials: Adverse events from Table 8 that occurred in at least 5% of patients treated with WELLBUTRIN XL and at a rate at least twice the placebo rate were constipation and flatulence.
Adverse Events During Taper or Following Discontinuation of WELLBUTRINÂ XL: Adverse events with onset during the 2Â weeks following down-titration of WELLBUTRINÂ XL from 300Â mg/day to 150Â mg/day were reported by 14% of patients compared to 18% of patients who continued on placebo.
Adverse events with onset during the 2Â weeks following discontinuation of WELLBUTRINÂ XL were reported by 9% of patients compared with 12% of patients following discontinuation of placebo.
Other Events Observed During the Clinical Development and Postmarketing Experience of Bupropion: In addition to the adverse events noted above, the following events have been reported in clinical trials and postmarketing experience with the sustained-release formulation of bupropion in depressed patients and in nondepressed smokers, as well as in clinical trials and postmarketing clinical experience with the immediate-release formulation of bupropion.
Adverse events for which frequencies are provided below occurred in clinical trials with the sustained-release formulation of bupropion. The frequencies represent the proportion of patients who experienced a treatment-emergent adverse event on at least one occasion in placebo-controlled studies for depression (n = 987) or smoking cessation (n = 1,013), or patients who experienced an adverse event requiring discontinuation of treatment in an open-label surveillance study with the sustained-release formulation of bupropion (n = 3,100). All treatment-emergent adverse events are included except those uled in Tables 2 through 8, those events uled in other safety-related sections, those adverse events subsumed under COSTART terms that are either overly general or excessively specific so as to be uninformative, those events not reasonably associated with the use of the drug, and those events that were not serious and occurred in fewer than 2 patients. Events of major clinical importance are described in the WARNINGS and PRECAUTIONS sections of the labeling.
Events are further categorized by body system and uled in order of decreasing frequency according to the following definitions of frequency: Frequent adverse events are defined as those occurring in at least 1/100Â patients. Infrequent adverse events are those occurring in 1/100 to 1/1,000 patients, while rare events are those occurring in less than 1/1,000 patients.
Adverse events for which frequencies are not provided occurred in clinical trials or postmarketing experience with bupropion. Only those adverse events not previously uled for sustained-release bupropion are included. The extent to which these events may be associated with WELLBUTRINÂ XL is unknown.
Body (General): Infrequent were chills, facial edema, musculoskeletal chest pain, and photosensitivity. Rare was malaise. Also observed were arthralgia, myalgia, and fever with rash and other symptoms suggestive of delayed hypersensitivity. These symptoms may resemble serum sickness (see PRECAUTIONS ).
Cardiovascular: Infrequent were postural hypotension, stroke, tachycardia, and vasodilation. Rare was syncope. Also observed were complete atrioventricular block, extrasystoles, hypotension, hypertension (in some cases severe, see PRECAUTIONS ), myocardial infarction, phlebitis, and pulmonary embolism.
Digestive: Infrequent were abnormal liver function, bruxism, gastric reflux, gingivitis, glossitis, increased salivation, jaundice, mouth ulcers, stomatitis, and thirst. Rare was edema of tongue. Also observed were colitis, esophagitis, gastrointestinal hemorrhage, gum hemorrhage, hepatitis, intestinal perforation, liver damage, pancreatitis, and stomach ulcer.
Endocrine: Also observed were hyperglycemia, hypoglycemia, and syndrome of inappropriate antidiuretic hormone.
Hemic and Lymphatic: Infrequent was ecchymosis. Also observed were anemia, leukocytosis, leukopenia, lymphadenopathy, pancytopenia, and thrombocytopenia. Altered PT and/or INR, infrequently associated with hemorrhagic or thrombotic complications, were observed when bupropion was coadministered with warfarin.
Metabolic and Nutritional: Infrequent were edema and peripheral edema. Also observed was glycosuria.
Musculoskeletal: Infrequent were leg cramps. Also observed were muscle rigidity/fever/rhabdomyolysis and muscle weakness.
Nervous System: Infrequent were abnormal coordination, decreased libido, depersonalization, dysphoria, emotional lability, hostility, hyperkinesia, hypertonia, hypesthesia, suicidal ideation, and vertigo. Rare were amnesia, ataxia, derealization, and hypomania. Also observed were abnormal electroencephalogram (EEG), aggression, akinesia, aphasia, coma, completed suicide, delirium, delusions, dysarthria, dyskinesia, dystonia, euphoria, extrapyramidal syndrome, hallucinations, hypokinesia, increased libido, manic reaction, neuralgia, neuropathy, paranoid ideation, restlessness, suicide attempt, and unmasking tardive dyskinesia.
Respiratory: Rare was bronchospasm. Also observed was pneumonia.
Skin: Rare was maculopapular rash. Also observed were alopecia, angioedema, exfoliative dermatitis, and hirsutism.
Special Senses: Infrequent were accommodation abnormality and dry eye. Also observed were deafness, diplopia, increased intraocular pressure, and mydriasis.
Urogenital: Infrequent were impotence, polyuria, and prostate disorder. Also observed were abnormal ejaculation, cystitis, dyspareunia, dysuria, gynecomastia, menopause, painful erection, salpingitis, urinary incontinence, urinary retention, and vaginitis.
Drug Abuse And Dependence
CONTROLLED SUBSTANCE SECTION
Controlled Substance Class: Bupropion is not a controlled substance.
Humans: Controlled clinical studies of bupropion (immediate-release formulation) conducted in normal volunteers, in subjects with a history of multiple drug abuse, and in depressed patients showed some increase in motor activity and agitation/exclient.
In a population of individuals experienced with drugs of abuse, a single dose of 400Â mg of bupropion produced mild amphetamine-like activity as compared to placebo on the Morphine-Benzedrine Subscale of the Addiction Research Center Inventories (ARCI), and a score intermediate between placebo and amphetamine on the Liking Scale of the ARCI. These scales measure general feelings of euphoria and drug desirability.
Findings in clinical trials, however, are not known to reliably predict the abuse potential of drugs. Nonetheless, evidence from single-dose studies does suggest that the recommended daily dosage of bupropion when administered in divided doses is not likely to be especially reinforcing to amphetamine or stimulant abusers. However, higher doses that could not be tested because of the risk of seizure might be modestly attractive to those who abuse stimulant drugs.
Animals: Studies in rodents and primates have shown that bupropion exhibits some pharmacologic actions common to psychostimulants. In rodents, it has been shown to increase locomotor activity, elicit a mild stereotyped behavioral response, and increase rates of responding in several schedule-controlled behavior paradigms. In primate models to assess the positive reinforcing effects of psychoactive drugs, bupropion was self-administered intravenously. In rats, bupropion produced amphetamine-like and cocaine-like discriminative stimulus effects in drug discrimination paradigms used to characterize the subjective effects of psychoactive drugs.
Overdosage
Human Overdose Experience: Overdoses of up to 30Â g or more of bupropion have been reported. Seizure was reported in approximately one third of all cases. Other serious reactions reported with overdoses of bupropion alone included hallucinations, loss of consciousness, sinus tachycardia, and ECG changes such as conduction disturbances (including QRS prolongation) or arrhythmias. Fever, muscle rigidity, rhabdomyolysis, hypotension, stupor, coma, and respiratory failure have been reported mainly when bupropion was part of multiple drug overdoses.
Although most patients recovered without sequelae, deaths associated with overdoses of bupropion alone have been reported in patients ingesting large doses of the drug. Multiple uncontrolled seizures, bradycardia, cardiac failure, and cardiac arrest prior to death were reported in these patients.
Overdosage Management: Ensure an adequate airway, oxygenation, and ventilation. Monitor cardiac rhythm and vital signs. EEG monitoring is also recommended for the first 48Â hours post-ingestion. General supportive and symptomatic measures are also recommended. Induction of emesis is not recommended.
Activated charcoal should be administered. There is no experience with the use of forced diuresis, dialysis, hemoperfusion, or exchange transfusion in the management of bupropion overdoses. No specific antidotes for bupropion are known.
Due to the dose-related risk of seizures with WELLBUTRINÂ XL, hospitalization following suspected overdose should be considered. Based on studies in animals, it is recommended that seizures be treated with intravenous benzodiazepine administration and other supportive measures, as appropriate.
In managing overdosage, consider the possibility of multiple drug involvement. The physician should consider contacting a poison control center for additional information on the treatment of any overdose. Telephone numbers for certified poison control centers are uled in the Physicians' Desk Reference (PDR).
Dosage And Administration
General Dosing Considerations: It is particularly important to administer WELLBUTRINÂ XL in a manner most likely to minimize the risk of seizure (see WARNINGS ). Gradual escalation in dosage is also important if agitation, motor restlessness, and insomnia, often seen during the initial days of treatment, are to be minimized. If necessary, these effects may be managed by temporary reduction of dose or the short-term administration of an intermediate to long-acting sedative hypnotic. A sedative hypnotic usually is not required beyond the first week of treatment. Insomnia may also be minimized by avoiding bedtime doses. If distressing, untoward effects supervene, dose escalation should be stopped. WELLBUTRINÂ XL tablets should be swallowed whole and not crushed, divided, or chewed as this may lead to an increased risk of adverse effects including seizures. WELLBUTRIN XL may be taken without regard to meals.
Major Depressive Disorder: Initial Treatment: The usual adult target dose for WELLBUTRINÂ XL is 300Â mg/day, given once daily in the morning. Dosing with WELLBUTRINÂ XL should begin at 150Â mg/day given as a single daily dose in the morning. If the 150-mg initial dose is adequately tolerated, an increase to the 300-mg/day target dose, given as once daily, may be made as early as day 4 of dosing. There should be an interval of at least 24Â hours between successive doses.
Increasing the Dosage Above 300 mg/day : As with other antidepressants, the full antidepressant effect of WELLBUTRINÂ XL may not be evident until 4Â weeks of treatment or longer. An increase in dosage to the maximum of 450Â mg/day, given as a single dose, may be considered for patients in whom no clinical improvement is noted after several weeks of treatment at 300Â mg/day.
Maintenance Treatment: It is generally agreed that acute episodes of depression require several months or longer of sustained pharmacological therapy beyond response to the acute episode. It is unknown whether or not the dose of WELLBUTRINÂ XL needed for maintenance treatment is identical to the dose needed to achieve an initial response. Patients should be periodically reassessed to determine the need for maintenance treatment and the appropriate dose for such treatment.
Seasonal Affective Disorder: For the prevention of seasonal major depressive episodes associated with seasonal affective disorder, WELLBUTRINÂ XL should generally be initiated in the autumn prior to the onset of depressive symptoms. Treatment should continue through the winter season and should be tapered and discontinued in early spring. The timing of initiation and duration of treatment should be individualized based on the patient's historical pattern of seasonal major depressive episodes. Patients whose seasonal depressive episodes are infrequent or not associated with significant impairment should not generally be treated prophylactically.
Dosing with WELLBUTRINÂ XL should begin at 150Â mg/day given as a single daily dose in the morning. If the 150-mg initial dose is adequately tolerated, the dose of WELLBUTRINÂ XL should be increased to the 300-mg/day dose after 1Â week. If the 300-mg dose is not adequately tolerated, the dose can be reduced to 150Â mg/day. The usual adult target dose for WELLBUTRINÂ XL is 300Â mg/day, given once daily in the morning.
For patients taking 300Â mg/day during the autumn-winter season, the dose should be tapered to 150Â mg/day for 2Â weeks prior to discontinuation.
Doses of WELLBUTRINÂ XL above 300Â mg/day have not been studied for the prevention of seasonal major depressive episodes.
Switching Patients from WELLBUTRIN Tablets or from WELLBUTRINÂ SR Sustained-Release Tablets: When switching patients from WELLBUTRIN Tablets to WELLBUTRINÂ XL or from WELLBUTRINÂ SR Sustained-Release Tablets to WELLBUTRINÂ XL, give the same total daily dose when possible. Patients who are currently being treated with WELLBUTRIN Tablets at 300Â mg/day (for example, 100Â mg 3 times a day) may be switched to WELLBUTRINÂ XL 300Â mg once daily. Patients who are currently being treated with WELLBUTRIN SR Sustained-Release Tablets at 300Â mg/day (for example, 150Â mg twice daily) may be switched to WELLBUTRINÂ XL 300Â mg once daily.
Dosage Adjustment for Patients With Impaired Hepatic Function: WELLBUTRINÂ XL should be used with extreme caution in patients with severe hepatic cirrhosis. The dose should not exceed 150Â mg every other day in these patients. WELLBUTRINÂ XL should be used with caution in patients with hepatic impairment (including mild-to-moderate hepatic cirrhosis) and a reduced frequency and/or dose should be considered in patients with mild-to-moderate hepatic cirrhosis (see CLINICAL PHARMACOLOGY, WARNINGS, and PRECAUTIONS ).
Dosage Adjustment for Patients With Impaired Renal Function: WELLBUTRINÂ XL should be used with caution in patients with renal impairment and a reduced frequency and/or dose should be considered (see CLINICAL PHARMACOLOGY and PRECAUTIONS ).
How Supplied
WELLBUTRINÂ XL Extended-Release Tablets, 150Â mg of bupropion hydrochloride, are creamy-white to pale yellow, round, tablets printed with "WELLBUTRINÂ XLÂ 150" in bottles of 30Â (NDC 64455-730-30) and 90 (NDC 64455-730-90).
WELLBUTRINÂ XL Extended-Release Tablets, 300Â mg of bupropion hydrochloride, are creamy-white to pale yellow, round, tablets printed with "WELLBUTRINÂ XLÂ 300" in bottles of 30Â (64455-731-30 ).
STORAGE AND HANDLING SECTION
Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F) [see USP Controlled Room Temperature].
Medication Guide
WELLBUTRIN XL®* (WELL byu-trin)
(bupropion hydrochloride extended-release tablets)
Read this Medication Guide carefully before you start using WELLBUTRINÂ XL and each time you get a refill. There may be new information. This information does not take the place of talking with your doctor about your medical condition or your treatment. If you have any questions about WELLBUTRINÂ XL, ask your doctor or pharmacist.
IMPORTANT: Be sure to read the three sections of this Medication Guide. The first section is about the risk of suicidal thoughts and actions with antidepressant medicines, the second section is about the risk of changes in thinking and behavior, depression and suicidal thoughts or actions with medicines used to quit smoking; and the third section is entitled "What Other Important Information Should I Know About WELLBUTRINÂ XL?"
Antidepressant Medicines, Depression and Other Serious Mental Illnesses, and Suicidal Thoughts or Actions
This section of the Medication Guide is only about the risk of suicidal thoughts and actions with antidepressant medicines. Talk to your doctor or your family member's healthcare provider about:
all risks and benefits of treatment with antidepressant medicines
all treatment choices for depression or other serious mental illness
What is the most important information I should know about antidepressant medicines, depression and other serious mental illnesses, and suicidal thoughts or actions?
- Antidepressant medicines may increase suicidal thoughts or actions in some children, teenagers, and young adults within the first few months of treatment.
- Depression and other serious mental illnesses are the most important causes of suicidal thoughts and actions. Some people may have a particularly high risk of having suicidal thoughts or actions. These include people who have (or have a family history of) bipolar illness (also called manic-depressive illness) or suicidal thoughts or actions.
- How can I watch for and try to prevent suicidal thoughts and actions in myself or a family member?
Pay close attention to any changes, especially sudden changes, in mood, behaviors, thoughts, or feelings. This is very important when an antidepressant medicine is started or when the dose is changed.
Call the healthcare provider right away to report new or sudden changes in mood, behavior, thoughts, or feelings.
Keep all follow-up visits with the healthcare provider as scheduled. Call the healthcare provider between visits as needed, especially if you have concerns about symptoms.
Call a healthcare provider right away if you or your family member has any of the following symptoms, especially if they are new, worse, or worry you:
thoughts about suicide or dying
attempts to commit suicide
new or worse depression
new or worse anxiety
feeling very agitated or restless
panic attacks
trouble sleeping (insomnia)
new or worse irritability
acting aggressive, being angry, or violent
acting on dangerous impulses
an extreme increase in activity and talking (mania)
other unusual changes in behavior or mood
What else do I need to know about antidepressant medicines?
Never stop an antidepressant medicine without first talking to a healthcare provider. Stopping an antidepressant medicine suddenly can cause other symptoms.
Antidepressants are medicines used to treat depression and other illnesses. It is important to discuss all the risks of treating depression and also the risks of not treating it. Patients and their families or other caregivers should discuss all treatment choices with the healthcare provider, not just the use of antidepressants.
Antidepressant medicines have other side effects. Talk to the healthcare provider about the side effects of the medicine prescribed for you or your family member.
Antidepressant medicines can interact with other medicines. Know all of the medicines that you or your family member takes. Keep a ul of all medicines to show the healthcare provider. Do not start new medicines without first checking with your healthcare provider.
Not all antidepressant medicines prescribed for children are FDA approved for use in children. Talk to your child's healthcare provider for more information.
WELLBUTRINÂ XL has not been studied in children under the age of 18 and is not approved for use in children and teenagers.
Â
Quitting Smoking, Quit-Smoking Medications, Changes in Thinking and Behavior, Depression, and Suicidal Thoughts or Actions
This section of the Medication Guide is only about the risk of changes in thinking and behavior, depression and suicidal thoughts or actions with drugs used to quit smoking.
Although WELLBUTRIN XL is not a treatment for quitting smoking, it contains the same active ingredient (bupropion hydrochloride) as ZYBAN® which is used to help patients quit smoking.
Some people have had changes in behavior, hostility, agitation, depression, suicidal thoughts or actions while taking bupropion to help them quit smoking. These symptoms can develop during treatment with bupropion or after stopping treatment with bupropion.
If you, your family member, or your caregiver notice agitation, hostility, depression or changes in thinking or behavior that are not typical for you, or you have any of the following symptoms, stop taking bupropion and call your healthcare provider right away:
thoughts about suicide or dying
attempts to commit suicide
new or worse depression
new or worse anxiety
panic attacks
feeling very agitated or restless
acting aggressive, being angry, or violent
acting on dangerous impulses
an extreme increase in activity and talking (mania)
abnormal thoughts or sensations
seeing or hearing things that are not there (hallucinations)
feeling people are against you (paranoia)
feeling confused
other unusual changes in behavior or mood
When you try to quit smoking, with or without bupropion, you may have symptoms that may be due to nicotine withdrawal, including urge to smoke, depressed mood, trouble sleeping, irritability, frustration, anger, feeling anxious, difficulty concentrating, restlessness, decreased heart rate, and increased appetite or weight gain. Some people have even experienced suicidal thoughts when trying to quit smoking without medication. Sometimes quitting smoking can lead to worsening of mental health problems that you already have, such as depression.
Before taking bupropion, tell your healthcare provider if you have ever had depression or other mental illnesses. You should also tell your doctor about any symptoms you had during other times you tried to quit smoking, with or without bupropion.
What Other Important Information Should I Know About WELLBUTRINÂ XL?
- Seizures: There is a chance of having a seizure (convulsion, fit) with WELLBUTRINÂ XL, especially in people:
- with certain medical problems.
- who take certain medicines.
The chance of having seizures increases with higher doses of WELLBUTRINÂ XL. For more information, see the sections "Who should not take WELLBUTRINÂ XL?" and "What should I tell my doctor before using WELLBUTRINÂ XL?" Tell your doctor about all of your medical conditions and all the medicines you take. Do not take any other medicines while you are using WELLBUTRINÂ XL unless your doctor has said it is okay to take them.
If you have a seizure while taking WELLBUTRINÂ XL, stop taking the tablets and call your doctor right away. Do not take WELLBUTRINÂ XL again if you have a seizure.
What is WELLBUTRINÂ XL?
- High blood pressure (hypertension): Some people get high blood pressure, that can be severe, while taking Wellbutrin XL. The chance of high blood pressure may be higher if you also use nicotine replacement therapy (such as a nicotine patch) to help you stop smoking.
- Severe allergic reactions: Some people have severe allergic reactions to Wellbutrin XL. Stop taking Wellbutrin XL and call your doctor right away if you get a rash, itching, hives, fever, swollen lymph glands, painful sores in the mouth or around the eyes, swelling of the lips or tongue, chest pain, or have trouble breathing. These could be signs of a serious allergic reaction.
- Unusual thoughts or behaviors: Some patients have unusual thoughts or behaviors while taking Wellbutrin XL, including delusions (believe you are someone else), hallucinations (seeing or hearing things that are not there), paranoia (feeling that people are against you), or feeling confused. If this happens to you, call your doctor.
WELLBUTRINÂ XL is a prescription medicine used to treat adults with a certain type of depression called major depressive disorder and for prevention of autumn-winter seasonal depression (seasonal affective disorder).
Who should not take WELLBUTRINÂ XL?
Do not take WELLBUTRINÂ XL if you:
- have or had a seizure disorder or epilepsy.
- are taking ZYBAN® (used to help people stop smoking) or any other medicines that contain bupropion hydrochloride, such as WELLBUTRIN®* Tablets or WELLBUTRIN SR, Sustained-Release Tablets. Bupropion is the same active ingredient that is in WELLBUTRIN XL.
- drink a lot of alcohol and abruptly stop drinking, or use medicines called sedatives (these make you sleepy) or benzodiazepines and you stop using them all of a sudden.
- have taken within the last 14 days medicine for depression called a monoamine oxidase inhibitor (MAOI), such as NARDIL®* (phenelzine sulfate), PARNATE®* (tranylcypromine sulfate), or MARPLAN®* (isocarboxazid).
- have or had an eating disorder such as anorexia nervosa or bulimia.
- are allergic to the active ingredient in WELLBUTRINÂ XL, bupropion, or to any of the inactive ingredients. See the end of this leaflet for a complete ul of ingredients in WELLBUTRINÂ XL.
What should I tell my doctor before using WELLBUTRINÂ XL?
- Tell your doctor if you have ever had depression, suicidal thoughts or actions, or other mental health problems. See "Antidepressant Medicines, Depression and Other Serious Mental Illnesses, and Suicidal Thoughts or Actions."
- Tell your doctor about your other medical conditions, including if you:
- are pregnant or plan to become pregnant. It is not known if WELLBUTRINÂ XL can harm your unborn baby.
- are breastfeeding. WELLBUTRINÂ XL passes through your milk. It is not known if WELLBUTRINÂ XL can harm your baby.
- have liver problems, especially cirrhosis of the liver.
- have kidney problems.
- have an eating disorder such as anorexia nervosa or bulimia.
- have had a head injury.
- have had a seizure (convulsion, fit).
- have a tumor in your nervous system (brain or spine).
- have had a heart attack, heart problems, or high blood pressure.
- are a diabetic taking insulin or other medicines to control your blood sugar.
- drink a lot of alcohol.
- abuse prescription medicines or street drugs.
- Tell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins and herbal supplements. Many medicines increase your chances of having seizures or other serious side effects if you take them while you are using WELLBUTRINÂ XL.
How should I take WELLBUTRINÂ XL?
- Take WELLBUTRINÂ XL exactly as prescribed by your doctor.
Do not chew, cut, or crush WELLBUTRINÂ XL tablets. If you do, the medicine will be released into your body too quickly. If this happens you may be more likely to get side effects including seizures. You must swallow the tablets whole. Tell your doctor if you cannot swallow medicine tablets.
- Take WELLBUTRINÂ XL at the same time each day.
- Take your doses of WELLBUTRINÂ XL at least 24 hours apart.
- You may take WELLBUTRINÂ XL with or without food.
- If you miss a dose, do not take an extra tablet to make up for the dose you forgot. Wait and take your next tablet at the regular time. This is very important. Too much WELLBUTRINÂ XL can increase your chance of having a seizure.
- If you take too much WELLBUTRINÂ XL, or overdose, call your local emergency room or poison control center right away.
- The WELLBUTRINÂ XL tablet is covered by a shell that slowly releases the medicine inside your body. You may notice something in your stool that looks like a tablet. This is normal. This is the empty shell passing from your body.
- Do not take any other medicines while using WELLBUTRINÂ XL unless your doctor has told you it is okay.
- If you are taking WELLBUTRINÂ XL for the treatment of major depressive disorder, it may take several weeks for you to feel that WELLBUTRINÂ XL is working. Once you feel better, it is important to keep taking WELLBUTRINÂ XL exactly as directed by your doctor. Call your doctor if you do not feel WELLBUTRINÂ XL is working for you.
- If you are taking WELLBUTRINÂ XL for the prevention of seasonal major depressive episodes associated with seasonal affective disorder, it is important to keep taking WELLBUTRINÂ XL through the autumn-winter season, or as directed by your doctor.
- Do not change your dose or stop taking WELLBUTRINÂ XL without talking with your doctor first.
What should I avoid while taking WELLBUTRINÂ XL?
- Do not drink a lot of alcohol while taking WELLBUTRINÂ XL. If you usually drink a lot of alcohol, talk with your doctor before suddenly stopping. If you suddenly stop drinking alcohol, you may increase your chance of having seizures.
- Do not drive a car or use heavy machinery until you know how WELLBUTRINÂ XL affects you. WELLBUTRINÂ XL can impair your ability to perform these tasks.
What are possible side effects of WELLBUTRINÂ XL?
WELLBUTRIN XL can cause serious side effects. Read this entire Medication Guide for more information about these serious side effects.
Common side effects reported in studies of major depressive disorder include weight loss, loss of appetite, dry mouth, skin rash, sweating, ringing in the ears, shakiness, stomach pain, agitation, anxiety, dizziness, trouble sleeping, muscle pain, nausea, fast heartbeat, sore throat, and urinating more often. In studies of seasonal affective disorder, common side effects included weight loss, constipation, and gas.
If you have nausea, take your medicine with food. If you have trouble sleeping, do not take your medicine too close to bedtime.
These are not all the side effects of WELLBUTRIN XL. For a complete ul, ask your doctor or pharmacist.
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Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or BTA Pharmaceuticals at 866-246-8245 (opt. 3).
How should I store WELLBUTRINÂ XL?
- Store WELLBUTRINÂ XL at room temperature. Store out of direct sunlight. Keep WELLBUTRINÂ XL in its tightly closed bottle.
- WELLBUTRINÂ XL tablets may have an odor.
General Information about WELLBUTRINÂ XL.
- Medicines are sometimes prescribed for purposes other than those uled in a Medication Guide. Do not use WELLBUTRINÂ XL for a condition for which it was not prescribed. Do not give WELLBUTRINÂ XL to other people, even if they have the same symptoms you have. It may harm them. Keep WELLBUTRINÂ XL out of the reach of children.
- If you take a urine drug screening test, WELLBUTRIN XL may make the test result positive for amphetamines. If you tell the person giving you the drug screening test that you are taking WELLBUTRIN XL, they can do a more specific drug screening test that should not have this problem.
This Medication Guide summarizes important information about WELLBUTRINÂ XL. For more information, talk with your doctor. You can ask your doctor or pharmacist for information about WELLBUTRINÂ XL that is written for health professionals or call 866-246-8245 (opt. 3).
What are the ingredients in WELLBUTRINÂ XL?
Active ingredient: bupropion hydrochloride.
Inactive ingredients: ethylcellulose aqueous dispersion, glyceryl behenate, methacrylic acid copolymer dispersion, polyvinyl alcohol, polyethylene glycol, povidone, silicon dioxide, and triethyl citrate. The tablets are printed with edible black ink.
*The following are registered trademarks of their respective manufacturers: WELLBUTRIN® and WELLBUTRIN XL®/GlaxoSmithKline; ZYBAN® /GlaxoSmithKline; PARNATE® / GlaxoSmithKline; NARDIL®/Warner Lambert Company; MARPLAN®/ Validus Pharmaceuticals LLC; KALETRA® /Abbott Laboratories.
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Rx Only
This Medication Guide has been approved by the U.S. Food and Drug Administration.
Manufactured by:Biovail CorporationMississauga, ON L5N 8M5, Canada
For:BTA Pharmaceuticals, Inc. (subsidiary of Biovail Corporation)Bridgewater, NJ 08807
Rev. 06/11
Principal Display Panel - 150 Mg Tablets
NDC 64455-730-90
Rx only
ONCE-DAILYWellbutrin XL® (bupropion hydrochlorideextended-release tablets)
150 mg 90 Tablets
WARNING: Do not use with other medicinesthat contain bupropion hydrochloride.
Federal Law requires dispensingof WELLBUTRIN XL® with theMedication Guide under this label.
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Principal Display Panel - 300 Mg Tablets
NDC 64455-731-30
Rx only
ONCE-DAILYWellbutrin XL® (bupropion hydrochlorideextended-release tablets)
300 mg 30 Tablets
WARNING: Do not use with other medicinesthat contain bupropion hydrochloride.
Federal Law requires dispensingof WELLBUTRIN XL® with theMedication Guide under this label.
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