ONDANSETRON (ondansetron hydrochloride 4 mg) Dailymed
Generic: ondansetron is used for the treatment of Alcoholism Postoperative Nausea and Vomiting
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1 Indications And Usage
Ondansetron tablets are indicated for the prevention of nausea and vomiting associated with:
• highly emetogenic cancer chemotherapy, including cisplatin greater than or equal to 50 mg/m2.• initial and repeat courses of moderately emetogenic cancer chemotherapy.• radiotherapy in patients receiving either total body irradiation, single high-dose fraction to the abdomen, or daily fractions to the abdomen.
Ondansetron tablets are also indicated for the prevention of postoperative nausea and/or vomiting.
Ondansetron tablets are a 5-HT3 receptor antagonist indicated for the prevention of:
• nausea and vomiting associated with highly emetogenic cancer chemotherapy, including cisplatin greater than or equal to 50 mg/m2.(1) • nausea and vomiting associated with initial and repeat courses of moderately emetogenic cancer chemotherapy.(1) • nausea and vomiting associated with radiotherapy in patients receiving either total body irradiation, single high-dose fraction to the abdomen, or daily fractions to the abdomen.(1) • postoperative nausea and/or vomiting(1)
2 Dosage And Administration
• See full prescribing information for the recommended dosage in adults and pediatrics.(2) • Patients with severe hepatic impairment: do not exceed a total daily dose of 8 mg. (2.2 ,8.6 )2.1 Dosage
The recommended dosage regimens for adult and pediatric patients are described in Table 1 and Table 2, respectively.
Table 1: Adult Recommended Dosage Regimen for Prevention of Nausea and Vomiting
Indication
Dosage Regimen
Highly Emetogenic Cancer Chemotherapy
A single 24 mg dose administered 30 minutes before
the start of single-day highly emetogenic chemotherapy,
including cisplatin greater than or equal to 50 mg/m2
Moderately Emetogenic Cancer Chemotherapy
8 mg administered 30 minutes before the start of chemotherapy, with a subsequent 8 mg dose 8 hours after the first dose.
Then administer 8 mg twice a day (every 12 hours) for 1 to 2 days after completion of chemotherapy
Radiotherapy
For total body irradiation: 8 mg administered 1 to 2 hours before each fraction of radiotherapy each day.
For single high-dose fraction radiotherapy to the abdomen: 8 mg administered 1 to 2 hours before radiotherapy, with subsequent 8 mg doses every 8 hours after the first dose for 1 to 2 days after completion of radiotherapy.
For daily fractionated radiotherapy to the abdomen: 8 mg administered 1 to 2 hours before radiotherapy, with subsequent 8 mg doses every 8 hours after the first dose for each day radiotherapy is given.
Postoperative
16 mg administered 1 hour before induction of anesthesia
Table 2: Pediatric Recommended Dosage Regimen for Prevention of Nausea and Vomiting
Indication
Dosage Regimen
Moderately Emetogenic Cancer Chemotherapy
12 to 17 years of age: 8 mg administered 30 minutes before the start of chemotherapy, with a subsequent 8 mg dose 8 hours after the first dose.
Then administer 8 mg twice a day a day (every 12 hours) for 1 to 2 days after completion of chemotherapy.
4 to 11 years of age: 4 mg administered 30 minutes before
the start of chemotherapy, with a subsequent 4 mg dose 4 and 8 hours after the first dose.
Then administer 4 mg three times a day for 1 to 2 days after completion of chemotherapy.
2.2 Dosage in Hepatic Impairment
In patients with severe hepatic impairment (Child-Pugh score of 10 or greater), do not exceed a total daily dose of 8 mg [see Use in Specific Populations (8.6), Clinical Pharmacology (12.3)].
3 Dosage Forms And Strengths
Ondansetron Tablets USP, are available in the following strengths:
• 4 mg – white, oval, film-coated tablets engraved with “4” on one side and “NO” on other side.• 8 mg – yellow, oval, film-coated tablets engraved with “8” on one side and “NO” on the other side.
Tablets: 4 mg and 8 mg(3)
4 Contraindications
Ondansetron tablets are contraindicated in patients:
• known to have hypersensitivity (e.g., anaphylaxis) to ondansetron or any of the components of the formulation [see Adverse Reactions (6.2)].• receiving concomitant apomorphine due to the risk of profound hypotension and loss of consciousness.
• Patients known to have hypersensitivity (e.g., anaphylaxis) to ondansetron or any components of the formulation.(4) • Concomitant use of apomorphine.(4)
5 Warnings And Precautions
• Hypersensitivity reactions including anaphylaxis and bronchospasm: Discontinue ondansetron tablets if suspected. Monitor and treat promptly per standard of care until signs and symptoms resolve.(5.1) • QT interval prolongation and Torsade de Pointes: Avoid in patients with congenital long QT syndrome; monitor with electrocardiograms (ECGs) if concomitant electrolyte abnormalities, cardiac failure or arrhythmias, or use of other QT prolonging drugs.(5.2) • Serotonin syndrome: Reported with 5-HT3 receptor antagonists alone but particularly with concomitant use of serotonergic drugs. If such symptoms occur, discontinue ondansetron tablets and initiate supportive treatment. If concomitant use of ondansetron tablets with other serotonergic drugs is clinically warranted, patients should be made aware of a potential increased risk for serotonin syndrome.(5.3) • Masking of progressive ileus and/or gastric distention following abdominal surgery or chemotherapy induced nausea and vomiting: Monitor for decreased bowel activity, particularly in patients with risk factors for gastrointestinal obstruction.(5.4) 5.1 Hypersensitivity Reactions
Hypersensitivity reactions, including anaphylaxis and bronchospasm, have been reported in patients who have exhibited hypersensitivity to other selective 5-HT3 receptor antagonists. If hypersensitivity reactions occur, discontinue use of ondansetron tablets; treat promptly per standard of care and monitor until signs and symptoms resolve [see Contraindications (4)].
5.2 QT Prolongation
Electrocardiogram (ECG) changes including QT interval prolongation have been seen in patients receiving ondansetron. In addition, postmarketing cases of Torsade de Pointes have been reported in patients using ondansetron tablets. Avoid ondansetron tablets in patients with congenital long QT syndrome. ECG monitoring is recommended in patients with electrolyte abnormalities (e.g., hypokalemia or hypomagnesemia), congestive heart failure, bradyarrhythmias, or patients taking other medicinal products that lead to QT prolongation [see Clinical Pharmacology (12.2)].
5.3 Serotonin Syndrome
The development of serotonin syndrome has been reported with 5-HT3 receptor antagonists alone. Most reports have been associated with concomitant use of serotonergic drugs (e.g., selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors, mirtazapine, fentanyl, lithium, tramadol, and intravenous methylene blue). Some of the reported cases were fatal. Serotonin syndrome occurring with overdose of ondansetron tablets alone has also been reported. The majority of reports of serotonin syndrome related to 5-HT3 receptor antagonist use occurred in a post-anesthesia care unit or an infusion center.
Symptoms associated with serotonin syndrome may include the following combination of signs and symptoms: mental status changes (e.g., agitation, hallucinations, delirium, and coma), autonomic instability (e.g., tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, hyperthermia), neuromuscular symptoms (e.g., tremor, rigidity, myoclonus, hyperreflexia, incoordination), seizures, with or without gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea). Patients should be monitored for the emergence of serotonin syndrome, especially with concomitant use of ondansetron tablets and other serotonergic drugs. If symptoms of serotonin syndrome occur, discontinue ondansetron tablets and initiate supportive treatment. Patients should be informed of the increased risk of serotonin syndrome, especially if ondansetron tablets is used concomitantly with other serotonergic drugs [see Drug Interactions (7.1), Overdosage (10)].
5.4 Masking of Progressive Ileus and Gastric Distension
The use of ondansetron tablets in patients following abdominal surgery or in patients with chemotherapy-induced nausea and vomiting may mask a progressive ileus and/or gastric distension. Monitor for decreased bowel activity, particularly in patients with risk factors for gastrointestinal obstruction.
Ondansetron tablets are not a drug that stimulates gastric or intestinal peristalsis. It should not be used instead of nasogastric suction.
6 Adverse Reactions
The most common adverse reactions in adults for the:
• prevention of chemotherapy-induced (greater than or equal to 5%) are: headache, malaise/fatigue, constipation, diarrhea.(6.1) • prevention of radiation-induced nausea and vomiting (greater than or equal to 2%) are: headache, constipation, and diarrhea.(6.1) • prevention of postoperative nausea and vomiting (greater than or equal to 9%) are: headache and hypoxia.(6.1)
To report SUSPECTED ADVERSE REACTIONS, contact Sun Pharmaceutical Industries, Inc. at 1-800-406-7984 or FDA at 1-800-FDA-1088 orwww.fda.gov/medwatch.
6.1 Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.
The following adverse reactions have been reported in clinical trials of patients treated with ondansetron, the active ingredient of ondansetron tablets. A causal relationship to therapy with ondansetron tablets was unclear in many cases.
Prevention of Chemotherapy-Induced Nausea and Vomiting
The most common adverse reactions reported in greater than or equal to 4% of 300 adults receiving a single 24 mg dose of ondansetron tablets orally in 2 trials for the prevention of nausea and vomiting associated with highly emetogenic chemotherapy (cisplatin greater than or equal to 50 mg/m2) were: headache (11%) and diarrhea (4%).
The most common adverse reactions reported in 4 trials in adults for the prevention of nausea and vomiting associated with moderately emetogenic chemotherapy (primarily cyclophosphamide-based regimens) are shown in Table 3.
Table 3. Most Common Adverse Reactions in Adultsa for the Prevention of Nausea and Vomiting Associated with Moderately Emetogenic Chemotherapy [Primarily Cyclophosphamide-based Regimens]
Adverse Reaction
Ondansetron Tablets 8 mg Twice
Daily (n = 242)
Placebo
(n = 262)
Headache
58 (24%)
34 (13%)
Malaise/fatigue
32 (13%)
6 (2%)
Constipation
22 (9%)
1 (<1%)
Diarrhea
15 (6%)
10 (4%)
a Reported in greater than or equal to 5% of patients treated with ondansetron tablets and at a rate that exceeded placebo.
Less Common Adverse Reactions
Central Nervous System: Extrapyramidal reactions (less than 1% of patients).
Hepatic: Aspartate transaminase (AST) and/or alanine transaminase (ALT) values exceeded twice the upper limit of normal in approximately 1% to 2% of 723 patients receiving ondansetron tablets and cyclophosphamide-based chemotherapy in US clinical trials. The increases were transient and did not appear to be related to dose or duration of therapy. On repeat exposure, similar transient elevations in transaminase values occurred in some courses, but symptomatic hepatic disease did not occur. The role of cancer chemotherapy in these biochemical changes is unclear.
Liver failure and death has been reported in cancer patients receiving concurrent medications, including potentially hepatotoxic cytotoxic chemotherapy and antibiotics. The etiology of the liver failure is unclear.
Integumentary: Rash (approximately 1% of patients).
Other (less than 2%): Anaphylaxis, bronchospasm, tachycardia, angina, hypokalemia, electrocardiographic alterations, vascular occlusive events, and grand mal seizures. Except for bronchospasm and anaphylaxis, the relationship to ondansetron tablets is unclear.
Prevention of Radiation-Induced Nausea and Vomiting
The most common adverse reactions (greater than or equal to 2%) reported in patients receiving ondansetron tablets and concurrent radiotherapy were similar to those reported in patients receiving ondansetron tablets and concurrent chemotherapy and were headache, constipation, and diarrhea.
Prevention of Postoperative Nausea and Vomiting
The most common adverse reactions reported in adults in trial(s) of prevention of postoperative nausea and vomiting are shown in Table 4. In these trial(s), patients were receiving multiple concomitant perioperative and postoperative medications in both treatment groups.
Table 4. Most Common Adverse Reactions in Adultsa for the Prevention of Postoperative Nausea and Vomiting
Adverse Reaction
Ondansetron Tablets 16 mg as a Single Dose
(n = 550)
Placebo
(n = 262)
Headache
49 (9%)
27 (5%)
Hypoxia
49 (9%)
35 (7%)
Pyrexia
45 (8%)
34 (6%)
Dizziness
36 (7%)
34 (6%)
Gynecological disorder
36 (7%)
33 (6%)
Anxiety/agitation
33 (6%)
29 (5%)
Urinary retention
28 (5%)
18 (3%)
Pruritus
27 (5%)
20 (4%)
a Reported in greater than or equal to 5% of patients treated with ondansetron tablets and at a rate that exceeded placebo.
6.2 Postmarketing Experience
The following adverse reactions have been identified during post-approval use of ondansetron. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Cardiovascular
Arrhythmias (including ventricular and supraventricular tachycardia, premature ventricular contractions, and atrial fibrillation), bradycardia, electrocardiographic alterations (including second-degree heart block, QT/QTc interval prolongation, and ST segment depression), palpitations, and syncope. Rarely and predominantly with intravenous ondansetron, transient ECG changes including QT interval prolongation have been reported.
General
Flushing. Rare cases of hypersensitivity reactions, sometimes severe (e.g., anaphylactic reactions, angioedema, bronchospasm, shortness of breath, hypotension, laryngeal edema, stridor) have also been reported.
Laryngospasm, shock, and cardiopulmonary arrest have occurred during allergic reactions in patients receiving injectable ondansetron.
Hepatobiliary
Liver enzyme abnormalities.
Lower Respiratory
Hiccups.
Neurology
Oculogyric crisis, appearing alone, as well as with other dystonic reactions.
Skin
Urticaria, Stevens-Johnson syndrome, and toxic epidermal necrolysis.
Eye Disorders
Cases of transient blindness, predominantly during intravenous administration, have been reported. These cases of transient blindness were reported to resolve within a few minutes up to 48 hours.
7 Drug Interactions
7.1 Serotonergic Drugs
Serotonin syndrome (including altered mental status, autonomic instability, and neuromuscular symptoms) has been described following the concomitant use of 5-HT3 receptor antagonists and other serotonergic drugs, including selective serotonin reuptake inhibitors (SSRIs) and serotonin and noradrenaline reuptake inhibitors (SNRIs). Monitor for the emergence of serotonin syndrome. If symptoms occur, discontinue ondansetron tablets and initiate supportive treatment [see Warnings and Precautions (5.3)].
7.2 Drugs Affecting Cytochrome P-450 Enzymes
Ondansetron does not itself appear to induce or inhibit the cytochrome P-450 drug-metabolizing enzyme system of the liver [see Clinical Pharmacology (12.3)]. Because ondansetron is metabolized by hepatic cytochrome P-450 drug-metabolizing enzymes (CYP3A4, CYP2D6, CYP1A2), inducers or inhibitors of these enzymes may change the clearance and, hence, the half-life of ondansetron. In patients treated with potent inducers of CYP3A4 (i.e., phenytoin, carbamazepine, and rifampin), the clearance of ondansetron was significantly increased and ondansetron blood concentrations were decreased. However, on the basis of available data, no dosage adjustment for ondansetron tablets is recommended for patients on these drugs [see Clinical Pharmacology (12.3)].
7.3 Tramadol
Although no pharmacokinetic drug interaction between ondansetron and tramadol has been observed, data from 2 small trials indicate that when used together, ondansetron tablets may increase patient-controlled administration of tramadol. Monitor patients to ensure adequate pain control when ondansetron is administered with tramadol.
7.4 Chemotherapy
Carmustine, etoposide, and cisplatin do not affect the pharmacokinetics of ondansetron.
In a crossover trial in 76 pediatric patients, intravenous ondansetron did not increase systemic concentrations of high-dose methotrexate.
7.5 Alfentanil and Atracurium
Ondansetron tablets do not alter the respiratory depressant effects produced by alfentanil or the degree of neuromuscular blockade produced by atracurium. Interactions with general or local anesthetics have not been studied.
8 Use In Specific Populations
8.1 Pregnancy
Risk Summary
Available data do not reliably inform the association of ondansetron tablets and adverse fetal outcomes. Published epidemiological studies on the association between ondansetron and fetal outcomes have reported inconsistent findings and have important methodological limitations hindering interpretation (see Data). Reproductive studies in rats and rabbits did not show evidence of harm to the fetus when ondansetron was administered during organogenesis at approximately 6 and 24 times the maximum recommended human oral dose of 24 mg/day, based on body surface area, respectively (see Data).
The background risk of major birth defects and miscarriage for the indicated population is unknown. In the US general population, the estimated background risk of major birth defects and miscarriages in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.
Data
Human Data
Methodological limitations of the epidemiology studies preclude a reliable evaluation of the potential risk of adverse fetal outcomes with the use of ondansetron in pregnancy.
Two large retrospective cohort studies of ondansetron use in pregnancy have been published. In one study with 1,349 infants born to women who reported the use of ondansetron or received an ondansetron prescription in the first trimester, no increased risk for major congenital malformations was seen in aggregate analysis. In this same study, however, a sub-analysis for specific malformations reported an association between ondansetron exposure and cardiovascular defect (odds ratio (OR) 1.62 [95% CI (1.04, 2.14)]) and cardiac septal defect (OR) 2.05 [95% CI (1.19, 3.28)]). The second study examined 1970 women who received ondansetron prescription during pregnancy and reported no association between ondansetron exposure and major congenital malformations, miscarriage or stillbirth, and infants of low birth weight or small for gestational age. Important methodological limitations with these studies include the uncertainty of whether women who filled a prescription actually took the medication, the concomitant use of other medications or treatments, and other unadjusted confounders that may account for the study findings.
A case-control study evaluating associations between several common non-cardiac malformations and multiple antiemetic drugs reported an association between maternal use of ondansetron and isolated cleft palate (reported adjusted OR = 2.37 [95% CI (1.18, 4.76)]). However, this association could be a chance finding, given the large number of drugs-birth defect comparisons in this study. It is unknown whether ondansetron exposure in utero in the cases of cleft palate occurred during the time of palate formation (the palate is formed between the 6th and 9th weeks of pregnancy) or whether mothers of infants with cleft palate used other medications or had other risk factors for cleft palate in the offspring. In addition, no cases of isolated cleft palate were identified in the aforementioned 2 large retrospective cohort studies. At this time, there is no clear evidence that ondansetron exposure in early pregnancy can cause cleft palate.
Animal Data
In embryo-fetal development studies in rats and rabbits, pregnant animals received oral doses of ondansetron up to 15 mg/kg/day and 30 mg/kg/day, respectively, during the period of organogenesis. With the exception of a slight decrease in maternal body weight gain in the rabbits, there were no significant effects of ondansetron on the maternal animals or the development of the offspring. At doses of 15 mg/kg/day in rats and 30 mg/kg/day in rabbits, the maternal exposure margin was approximately 6 and 24 times the maximum recommended human oral dose of 24 mg/day, respectively, based on body surface area.
In a pre- and postnatal developmental toxicity study, pregnant rats received oral doses of ondansetron up to 15 mg/ kg/day from Day 17 of pregnancy to litter Day 21. With the exception of a slight reduction in maternal body weight gain, there were no effects upon the pregnant rats and the pre-and postnatal development of their offspring, including reproductive performance of the mated F1 generation. At a dose of 15 mg/kg/day in rats, the maternal exposure margin was approximately 6 times the maximum recommended human oral dose of 24 mg/day, based on body surface area.
8.2 Lactation
Risk Summary
It is not known whether ondansetron is present in human milk. There are no data on the effects of ondansetron tablets on the breastfed infant or the effects on milk production. However, it has been demonstrated that ondansetron is present in the milk of rats.
The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for ondansetron tablets and any potential adverse effects on the breast fed infant from ondansetron tablets or from the underlying maternal condition.
8.4 Pediatric Use
The safety and effectiveness of orally administered ondansetron tablets have been established in pediatric patients 4 years and older for the prevention of nausea and vomiting associated with moderately emetogenic cancer chemotherapy. Use of ondansetron tablets in these age-groups is supported by evidence from adequate and well-controlled studies of ondansetron tablets in adults with additional data from 3 open-label, uncontrolled, non-US trials in 182 pediatric patients aged 4 to 18 years with cancer who were given a variety of cisplatin or noncisplatin regimens [see Dosage and Administration (2.2), Clinical Studies (14.1)].
Additional information on the use of ondansetron in pediatric patients may be found in ondansetron injection prescribing information.
The safety and effectiveness of orally administered ondansetron tablets have not been established in pediatric patients for:
• prevention of nausea and vomiting associated with highly emetogenic cancer chemotherapy.• prevention of nausea and vomiting associated with radiotherapy.• prevention of postoperative nausea and/or vomiting.8.5 Geriatric Use
Of the total number of subjects enrolled in cancer chemotherapy-induced and postoperative nausea and vomiting in US-and foreign-controlled clinical trials, for which there were subgroup analyses, 938 (19%) were aged 65 years and older.
No overall differences in safety or effectiveness were observed between subjects 65 years of age and older and younger subjects. A reduction in clearance and increase in elimination half-life were seen in patients older than 75 years compared with younger subjects [see Clinical Pharmacology (12.3)]. There were an insufficient number of patients older than 75 years of age and older in the clinical trials to permit safety or efficacy conclusions in this age-group. Other 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. No dosage adjustment is needed in elderly patients.
8.6 Hepatic Impairment
No dosage adjustment is needed in patients with mild or moderate hepatic impairment.
In patients with severe hepatic impairment, clearance is reduced and the apparent volume of distribution is increased, resulting in a significant increase in the half-life of ondansetron. Therefore, do not exceed a total daily dose of 8 mg in patients with severe hepatic impairment (Child-Pugh score of 10 or greater) [see Dosage and Administration (2.2), Clinical Pharmacology (12.3)].
8.7 Renal Impairment
No dosage adjustment is recommended for patients with any degree of renal impairment (mild, moderate, or severe). There is no experience beyond first-day administration of ondansetron [see Clinical Pharmacology (12.3)].
9 Drug Abuse And Dependence
Animal studies have shown that ondansetron is not discriminated as a benzodiazepine nor does it substitute for benzodiazepines in direct addiction studies.
10 Overdosage
There is no specific antidote for ondansetron overdose. Patients should be managed with appropriate supportive therapy.
In addition to the adverse reactions uled above, the following adverse reactions have been described in the setting of ondansetron overdose: “Sudden blindness” (amaurosis) of 2 to 3 minutes’ duration plus severe constipation occurred in one patient that was administered 72 mg of ondansetron intravenously as a single dose. Hypotension (and faintness) occurred in a patient that took 48 mg of ondansetron tablets. Following infusion of 32 mg over only a 4-minute period, a vasovagal episode with transient second-degree heart block was observed. In all instances, the adverse reactions resolved completely.
Pediatric cases consistent with serotonin syndrome have been reported after inadvertent oral overdoses of ondansetron (exceeding estimated ingestion of 5 mg per kg) in young children. Reported symptoms included somnolence, agitation, tachycardia, tachypnea, hypertension, flushing, mydriasis, diaphoresis, myoclonic movements, horizontal nystagmus, hyperreflexia, and seizure. Patients required supportive care, including intubation in some cases, with complete recovery without sequelae within 1 to 2 days.
11 Description
The active ingredient in ondansetron tablets is ondansetron hydrochloride as the dihydrate, the racemic form of ondansetron and a selective blocking agent of the serotonin 5-HT3 receptor type. Chemically it is (±) 1, 2, 3, 9-tetrahydro-9-methyl-3-[(2-methyl-1H-imidazol-1-yl)methyl]-4H-carbazol-4-one, monohydrochloride, dihydrate. It has the following structural formula:
The empirical formula is C18H19N3O•HCl•2H2O, representing a molecular weight of 365.5.
Ondansetron hydrochloride dihydrate is a white to off-white powder that is soluble in water and normal saline. Each 4 mg ondansetron tablet, USP for oral administration contains ondansetron hydrochloride dihydrate equivalent to 4 mg of ondansetron. Each 8 mg ondansetron tablet, USP for oral administration contains ondansetron hydrochloride dihydrate equivalent to 8 mg of ondansetron. Each tablet also contains the inactive ingredients croscarmellose sodium, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, pregelatinized starch, titanium dioxide, triacetin, and iron oxide yellow (8 mg tablet only).
This product meets USP Dissolution Test 3.
12 Clinical Pharmacology
12.1 Mechanism of Action
Ondansetron is a selective 5-HT3 receptor antagonist. While its mechanism of action has not been fully characterized, ondansetron is not a dopamine-receptor antagonist. Serotonin receptors of the 5-HT3 type are present both peripherally on vagal nerve terminals and centrally in the chemoreceptor trigger zone of the area postrema. It is not certain whether ondansetron’s antiemetic action is mediated centrally, peripherally, or in both sites. However, cytotoxic chemotherapy appears to be associated with release of serotonin from the enterochromaffin cells of the small intestine. In humans, urinary 5-hydroxyindoleacetic acid (5-HIAA) excretion increases after cisplatin administration in parallel with the onset of emesis. The released serotonin may stimulate the vagal afferents through the 5-HT3 receptors and initiate the vomiting reflex.
12.2 Pharmacodynamics
In healthy subjects, single intravenous doses of 0.15 mg/kg of ondansetron had no effect on esophageal motility, gastric motility, lower esophageal sphincter pressure, or small intestinal transit time. Multiday administration of ondansetron has been shown to slow colonic transit in healthy subjects. Ondansetron has no effect on plasma prolactin concentrations.
Cardiac Electrophysiology
QTc interval prolongation was studied in a double-blind, single intravenous dose, placebo-and positive-controlled, crossover trial in 58 healthy subjects. The maximum mean (95% upper confidence bound) difference in QTcF from placebo after baseline correction was 19.5 (21.8) milliseconds and 5.6 (7.4) milliseconds after 15minute intravenous infusions of 32 mg and 8 mg of ondansetron injection, respectively. A significant exposure-response relationship was
identified between ondansetron concentration and ΔΔQTcF. Using the established exposure-response relationship, 24 mg infused intravenously over 15 minutes had a mean predicted (95% upper prediction interval) ΔΔQTcF of 14.0 (16.3) milliseconds. In contrast, 16 mg infused intravenously over 15 minutes using the same model had a mean predicted (95% upper prediction interval) ΔΔQTcF of 9.1 (11.2) milliseconds. In this study, the 8 mg dose infused over 15 minutes did not prolong the QT interval to any clinically relevant extent.
12.3 Pharmacokinetics
Absorption
Ondansetron is absorbed from the gastrointestinal tract and undergoes some first-pass metabolism. Mean bioavailability in healthy subjects, following administration of a single 8 mg tablet, is approximately 56%. Ondansetron systemic exposure does not increase proportionately to dose. The area under curve (AUC) from a 16 mg tablet was 24% greater than predicted from an 8 mg tablet dose. This may reflect some reduction of first-pass metabolism at higher oral doses.
Food Effects: Bioavailability is also slightly enhanced by the presence of food.
Distribution
Plasma protein binding of ondansetron as measured in vitro was 70% to 76% over the concentration range of 10 to 500 ng/mL. Circulating drug also distributes into erythrocytes.
Elimination
Metabolism and Excretion: Ondansetron is extensively metabolized in humans, with approximately 5% of a radiolabeled dose recovered as the parent compound from the urine. The metabolites are observed in the urine. The primary metabolic pathway is hydroxylation on the indole ring followed by subsequent glucuronide or sulfate conjugation.
In vitro metabolism studies have shown that ondansetron is a substrate for human hepatic cytochrome P-450 enzymes, including CYP1A2, CYP2D6, and CYP3A4. In terms of overall ondansetron turnover, CYP3A4 played the predominant role. Because of the multiplicity of metabolic enzymes capable of metabolizing ondansetron, it is likely that inhibition or loss of one enzyme (e.g., CYP2D6 genetic deficiency) will be compensated by others and may result in little change in overall rates of ondansetron elimination.
Although some nonconjugated metabolites have pharmacologic activity, these are not found in plasma at concentrations likely to significantly contribute to the biological activity of ondansetron.
Specific Populations
Age: Geriatric Population: A reduction in clearance and increase in elimination half-life are seen in patients older than 75 years compared to younger subjects [see Use in Specific Populations (8.5)].
Sex: Gender differences were shown in the disposition of ondansetron given as a single dose. The extent and rate of absorption are greater in women than men. Slower clearance in women, a smaller apparent volume of distribution (adjusted for weight), and higher absolute bioavailability resulted in higher plasma ondansetron concentrations. These higher plasma concentrations may in part be explained by differences in body weight between men and women. It is not known whether these sex-related differences were clinically important. More detailed pharmacokinetic information is contained in Tables 5 and 6.
Table 5. Pharmacokinetics in Male and Female Healthy Subjects after a Single Dose of a Ondansetron 8 mg Tablet
Age- group
(years)
Sex (M/F)
Mean
Weight
(kg)
N
Peak Plasma
Concentration
(ng/mL)
Time of
Peak Plasma
Concentration(h)
Mean
Elimination
Half-life
(h)
Systemic
Plasma
Clearance
L/h/kg
Absolute
Bioavailability
18-40 M
F
69.0
62.7
6
5
26.2
42.7
2.0
1.7
3.1
3.5
0.403
0.354
0.483
0.663
61-74 M
F
77.5
60.2
6
6
24.1
52.4
2.1
1.9
4.1
4.9
0.384
0.255
0.585
0.643
≥75 M
F
78.0
67.6
5
6
37.0
46.1
2.2
2.1
4.5
6.2
0.277
0.249
0.619
0.747
Table 6. Pharmacokinetics in Male and Female Healthy Subjects after a Single Dose of a Ondansetron 24 mg Tablet
Age- group
(years)
Sex (M/F)
Mean
Weight
(kg)
N
Peak Plasma
Concentration
(ng/mL)
Time of
Peak Plasma
Concentration(h)
Mean
Elimination
Half-life
(h)
18-43 M
F
84.1
71.8
8
8
125.8
194.4
1.9
1.6
4.7
5.8
Renal Impairment: Renal impairment is not expected to significantly influence the total clearance of ondansetron as renal clearance represents only 5% of the overall clearance. However, the mean plasma clearance of ondansetron was reduced by about 50% in patients with severe renal impairment (creatinine clearance less than 30 mL/min). The reduction in clearance was variable and not consistent with an increase in half-life [see Use in Specific Populations
(8.7)].
Hepatic Impairment: In patients with mild-to-moderate hepatic impairment, clearance is reduced 2-fold and mean half-life is increased to 11.6 hours compared with 5.7 hours in healthy subjects. In patients with severe hepatic impairment (Child-Pugh score of 10 or greater), clearance is reduced 2-fold to 3-fold and apparent volume of distribution is increased with a resultant increase in half-life to 20 hours [see Dosage and Administration (2.2), Use in Specific Populations (8.6) ].
Drug Interaction Studies
CYP3A4 Inducers: Ondansetron elimination may be affected by cytochrome P-450 inducers. In a pharmacokinetic trial of 16 epileptic patients maintained chronically on CYP3A4 inducers, carbamazepine, or phenytoin, a reduction in AUC, Cmax, and t½ of ondansetron was observed. This resulted in a significant increase in the clearance of ondansetron. However, this increase is not thought to be clinically relevant [see Drug Interactions (7.2)].
Chemotherapeutic Agents: Carmustine, etoposide, and cisplatin do not affect the pharmacokinetics of ondansetron [see Drug Interactions (7.4)].
Antacids: Concomitant administration of antacids does not alter the absorption of ondansetron.
13 Nonclinical Toxicology
13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
Carcinogenic effects were not seen in 2-year studies in rats and mice with oral ondansetron doses up to 10 mg/kg per day and 30 mg/kg per day, respectively (approximately 4 and 6 times the maximum recommended human oral dose of 24 mg per day, based on body surface area).
Ondansetron was not mutagenic in standard tests for mutagenicity.
Oral administration of ondansetron up to 15 mg/kg per day (approximately 6 times the maximum recommended human oral dose of 24 mg per day, based on body surface area) did not affect fertility or general reproductive performance of male and female rats.
14 Clinical Studies
14.1 Prevention of Chemotherapy-Induced Nausea and Vomiting
Highly Emetogenic Chemotherapy
In 2 randomized, double-blind, monotherapy trials, a single 24 mg oral dose of ondansetron tablets was superior to a relevant historical placebo control in the prevention of nausea and vomiting associated with highly emetogenic cancer chemotherapy, including cisplatin greater than or equal to 50 mg/m2. Steroid administration was excluded from these clinical trials. More than 90% of patients receiving a cisplatin dose greater than or equal to 50 mg/m2 in the historical-placebo comparator, experienced vomiting in the absence of antiemetic therapy.
The first trial compared oral doses of ondansetron 24 mg as a single dose, 8 mg every 8 hours for 2 doses, and 32 mg as a single dose in 357 adult cancer patients receiving chemotherapy regimens containing cisplatin greater than or equal to 50 mg/m2. The first or single dose was administered 30 minutes prior to chemotherapy. A total of 66% of patients in the ondansetron 24-mg once-a-day group, 55% in the ondansetron 8-mg twice-a-day group, and 55% in the ondansetron 32-mg once-a-day group, completed the 24-hour trial period with 0 emetic episodes and no rescue antiemetic medications, the primary endpoint of efficacy. Each of the 3 treatment groups was shown to be statistically significantly superior to a historical placebo control.
In the same trial, 56% of patients receiving a single 24 mg oral dose of ondansetron experienced no nausea during the 24-hour trial period, compared with 36% of patients in the oral ondansetron 8-mg twice-a-day group (P = 0.001) and 50% in the oral ondansetron 32-mg once-a-day group. Dosage regimens of ondansetron tablets 8 mg twice daily and 32 mg once daily are not recommended for the prevention of nausea and vomiting associated with highly emetogenic chemotherapy [see Dosage and Administration (2.1)].
In a second trial, efficacy of a single 24 mg oral dose of ondansetron tablets for the prevention of nausea and vomiting associated with highly emetogenic cancer chemotherapy, including cisplatin greater than or equal to 50 mg/m2, was confirmed.
Moderately Emetogenic Chemotherapy
A randomized, placebo-controlled, double-blind trial was conducted in the US in 67 patients receiving a cyclophosphamide-based chemotherapy regimen containing doxorubicin. The first 8 mg dose of ondansetron tablets was administered 30 minutes before the start of chemotherapy, with a subsequent dose 8 hours after the first dose, followed by 8 mg of ondansetron tablets twice a day for 2 days after the completion of chemotherapy.
Ondansetron tablets were significantly more effective than placebo in preventing vomiting. Treatment response was based on the total number of emetic episodes over the 3-day trial period. The results of this trial are summarized in Table 7:
Table 7: Emetic Episodes - Treatment Response in Patients Receiving Moderately Emetogenic Chemotherapy (Cyclophosphamide-based Regimen Containing Doxorubicin)
Ondansetron
Tablets
(n = 33)
Placebo
(n = 34)
P Value
Treatment response
0 Emetic episodes
1 to 2 Emetic episodes
More than 2 emetic episodes/withdrawn
20 (61%)
6 (18%)
7 (21%)
2 (6%)
8 (24%)
24 (71%)
<0.001
<0.001
Median number of emetic episodes
0.0
Undefineda
Median time to first emetic episode (hours)
Undefinedb
6.5
a Median undefined since at least 50% of the patients were withdrawn or had more than 2 emetic episodes.
b Median undefined since at least 50% of patients did not have any emetic episodes.
In a double-blind US trial in 336 patients receiving a cyclophosphamide-based chemotherapy regimen containing either methotrexate or doxorubicin, ondansetron tablets 8 mg administered twice a day, was as effective as ondansetron tablets 8 mg administered 3 times a day in preventing nausea and vomiting. Ondansetron Tablets 8 mg three times daily is not a recommended regimen for the treatment of moderately emetogenic chemotherapy [see Dosage and Administration (2.1)].
Treatment response was based on the total number of emetic episodes over the 3-day trial period. See Table 8 for the details of the dosage regimens studied and results of this trial.
Table 8: Emetic Episodes - Treatment Response after Ondansetron Tablets Administered Twice a Day and Three Times a Day
Ondansetron Tablets
8 mg Twice Dailya
(n = 165)
8 mg Three Times a Dayb
(n = 171)
Treatment response
0 Emetic episodes
1-2 Emetic episodes
More than 2 emetic episodes/withdrawn
101 (61%)
16 (10%)
48 (29%)
99 (58%)
17 (10%)
55 (32%)
Median number of emetic episodes
0.0
0.0
Median time to first emetic episode (h)
Undefinedc
Undefinedc
Median nausea scores (0-100)d
6
6
a The first 8 mg dose was administered 30 minutes before the start of emetogenic chemotherapy, with a subsequent 8 mg dose 8 hours after the first dose, followed by 8 mg administered twice a day for 2 days after the completion of chemotherapy.
b The first 8 mg dose was administered 30 minutes before the start of emetogenic chemotherapy, with subsequent 8 mg doses at 4 hours and 8 hours after the first dose, followed by 8 mg administered 3 times a day for 2 days after the completion of chemotherapy.
c Median undefined since at least 50% of patients did not have any emetic episodes.
d Visual analog scale assessment: 0 = no nausea, 100 = nausea as bad as it can be.
Re-treatment
In single-arm trials, 148 patients receiving cyclophosphamide-based chemotherapy were re-treated with ondansetron tablets 8 mg three times daily during subsequent chemotherapy for a total of 396 re-treatment courses. No emetic episodes occurred in 314 (79%) of the re-treatment courses, and only 1 to 2 emetic episodes occurred in 43 (11%) of the re-treatment courses.
Pediatric Trials
Three open-label, single-arm, non-US trials have been performed with 182 pediatric patients aged 4 to 18 years with cancer who were given a variety of cisplatin or noncisplatin regimens. The initial dose of ondansetron tablets injection ranged from 0.04 to 0.87 mg per kg (total dose of 2.16 mg to 12 mg) followed by the administration of oral doses of ondansetron tablets ranging from 4 to 24 mg daily for 3 days. In these trials, 58% of the 170 evaluable patients had a complete response (no emetic episodes) on Day 1. In 2 trials the response rates to ondansetron tablets 4 mg three times a day in patients younger than 12 years was similar to ondansetron tablets 8 mg three times daily in patients 12 to 18 years. Prevention of emesis in these pediatric patients was essentially the same as for adults.
14.2 Radiation-Induced Nausea and Vomiting
Total Body Irradiation
In a randomized, placebo-controlled, double-blind trial in 20 patients, 8 mg of ondansetron tablets administered 1.5 hours before each fraction of radiotherapy for 4 days was significantly more effective than placebo in preventing vomiting induced by total body irradiation. Total body irradiation consisted of 11 fractions (120 cGy per fraction) over 4 days for a total of 1,320 cGy. Patients received 3 fractions for 3 days, then 2 fractions on Day 4.
Single High-dose Fraction Radiotherapy
In an active-controlled, double-blind trial in 105 patients receiving single high-dose radiotherapy (800 to 1,000 cGy) over an anterior or posterior field size of greater than or equal to 80 cm2 to the abdomen, ondansetron tablets was significantly more effective than metoclopramide with respect to complete control of emesis (0 emetic episodes). Patients received the first dose of ondansetron tablets (8 mg) or metoclopramide (10 mg) 1 to 2 hours before radiotherapy. If radiotherapy was given in the morning, 8 mg of ondansetron tablets or 10 mg of metoclopramide was administered in the late afternoon and repeated again before bedtime. If radiotherapy was given in the afternoon, patients took 8 mg of ondansetron tablets or 10 mg of metoclopramide only once before bedtime. Patients continued the doses of oral medication three times daily for 3 days.
Daily Fractionated Radiotherapy
In an active-controlled, double-blind trial in 135 patients receiving a 1-to 4-week course of fractionated radiotherapy (180 cGy doses) over a field size of greater than or equal to 100 cm2 to the abdomen, ondansetron tablets was significantly more effective than prochlorperazine with respect to complete control of emesis (0 emetic episodes). Patients received the first dose of ondansetron tablets (8 mg) or prochlorperazine (10 mg) 1 to 2 hours before the first daily radiotherapy fraction, with subsequent 8 mg doses approximately every 8 hours on each day of radiotherapy.
14.3 Postoperative Nausea and Vomiting
In 2 placebo-controlled, double-blind trials (one conducted in the US and the other outside the US) in 865 females undergoing inpatient surgical procedures, ondansetron tablets 16 mg as a single dose or placebo was administered one hour before the induction of general balanced anesthesia (barbiturate, opioid, nitrous oxide, neuromuscular blockade, and supplemental isoflurane or enflurane), ondansetron tablets was significantly more effective than placebo in preventing postoperative nausea and vomiting.
No trials have been performed in males.
16 How Supplied/storage And Handling
Ondansetron Tablets
Ondansetron Tablets USP, 4 mg (ondansetron hydrochloride dihydrate equivalent to 4 mg of ondansetron), are white, oval, film-coated tablets engraved with “4” on one side and “NO” on another side. They are supplied as follows:
NDC 63304-458-30 Bottles of 30
Ondansetron Tablets USP, 8 mg (ondansetron hydrochloride dihydrate equivalent to 8 mg of ondansetron), are yellow, oval, film-coated tablets engraved with “8” on one side and “NO” on the other side. They are supplied as follows:
NDC 63304-459-30 Bottles of 30
Store at 20° to 25°C (68° to 77°F). [See USP Controlled Room Temperature].
17 Patient Counseling Information
QT Prolongation
Inform patients that ondansetron tablets may cause serious cardiac arrhythmias such as QT prolongation. Instruct patients to tell their healthcare provider right away if they perceive a change in their heart rate, if they feel lightheaded, or if they have a syncopal episode.
Hypersensitivity Reactions
Inform patients that ondansetron tablets may cause hypersensitivity reactions, some as severe as anaphylaxis and bronchospasm. Instruct patients to immediately report any signs and symptoms of hypersensitivity reactions, including fever, chills, rash, or breathing problems to their healthcare provider.
Masking of Progressive Ileus and Gastric Distension
Inform patients following abdominal surgery or those with chemotherapy-induced nausea and vomiting that ondansetron tablets may mask signs and symptoms of bowel obstruction. Instruct patients to immediately report any signs or symptoms consistent with a potential bowel obstruction to their healthcare provider.
Drug Interactions
• Instruct the patient to report the use of all medications, especially apomorphine, to their healthcare provider. Concomitant use of apomorphine and ondansetron tablets may cause a significant drop in blood pressure and loss of consciousness.• Advise patients of the possibility of serotonin syndrome with concomitant use of ondansetron tablets and another serotonergic agent such as medications to treat depression and migraines. Advise patients to seek immediate medical attention if the following symptoms occur: changes in mental status, autonomic instability, neuromuscular symptoms with or without gastrointestinal symptoms.
Distributed by:
Sun Pharmaceutical Industries, Inc.
Cranbury, NJ 08512 USA
Manufactured by:
Natco Pharma Limited
Kothur- 509 228, India
Revised: 01/2019
346169
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