Anzemet Injection

Anzemet Injection information, interactions and side effects, ANZEMET (dolasetron mesylate) is an antinauseant and antiemetic agent. Chemically, dolasetron mesylate is (2α,6α,8α,9aβ)-octahydro-3-oxo-2,6-methano-2H-quinolizin-8-yl-lH- indole-3-carboxylate monomethanesulfonate, monohydrate. It is a highly specific and selective serotonin subtype 3 (5-HT3) receptor antagonist both in vitro and in vivo. Dolasetron mesylate has the following structural formula:

anzemet-inj1

The empirical formula is C19H20N2O3 • CH3SO3H • H2O, with a molecular weight of 438.50.

Approximately 74% of dolasetron mesylate monohydrate is dolasetron base.

Dolasetron mesylate monohydrate is a white to off-white powder that is freely soluble in water and propylene glycol, slightly soluble in ethanol, and slightly soluble in normal saline.

ANZEMET Injection (dolasetron mesylate injection) is a clear, colorless, nonpyrogenic, sterile solution for intravenous administration. Each milliliter of ANZEMET Injection (dolasetron mesylate injection) contains 20 mg of dolasetron mesylate and 38.2 mg mannitol, USP, with an acetate buffer in water for injection. The pH of the resulting solution is 3.2 to 3.8.

ANZEMET Injection (dolasetron mesylate injection) multidose vials contain a clear, colorless, nonpyrogenic, sterile solution for intravenous administration. Each ANZEMET multidose vial contains 25 mL (500 mg) dolasetron mesylate. Each milliliter contains 20 mg dolasetron mesylate, 29 mg mannitol, USP, and 5 mg phenol, USP, with an acetate buffer in water for injection. The pH of the resulting solution is 3.2 to 3.7.

INDICATIONS

ANZEMET Injection (dolasetron mesylate injection) is indicated for the following:

(1) the prevention of nausea and vomiting associated with initial and repeat courses of emetogenic cancer chemotherapy, including high dose cisplatin;
(2)  the prevention of postoperative nausea and vomiting. As with other antiemetics, routine prophylaxis is not recommended for patients in whom there is little expectation that nausea and/or vomiting will occur postoperatively. In patients where nausea and/or vomiting must be avoided postoperatively, ANZEMET Injection is recommended even where the incidence of postoperative nausea and/or vomiting is low;
(3) the treatment of postoperative nausea and/or vomiting.

DOSAGE AND ADMINISTRATION

The recommended dose of ANZEMET Injection (dolasetron mesylate injection) should not be exceeded.

Prevention of Cancer Chemotherapy-Induced Nausea and Vomiting

Adults

The recommended intravenous dosage of ANZEMET Injection (dolasetron mesylate injection) from clinical trial results is 1.8 mg/kg given as a single dose approximately 30 minutes before chemotherapy (see Administration). Alternatively, for most patients, a fixed dose of 100 mg can be administered over 30 seconds.

Pediatric Patients

The recommended intravenous dosage in pediatric patients 2 to 16 years of age is 1.8 mg/kg given as a single dose approximately 30 minutes before chemotherapy, up to a maximum of 100 mg (see Administration). Safety and effectiveness in pediatric patients under 2 years of age have not been established.

ANZEMET Injection (dolasetron mesylate injection) mixed in apple or apple-grape juice may be used for oral dosing of pediatric patients. When ANZEMET Injection (dolasetron mesylate injection) is administered orally, the recommended dosage in pediatric patients 2 to 16 years of age is 1.8 mg/kg up to a maximum 100 mg dose given within 1 hour before chemotherapy.

The diluted product may be kept up to 2 hours at room temperature before use.

Use in the Elderly, in Renal Failure Patients, or in Hepatically Impaired Patients

No dosage adjustment is recommended.

Prevention or Treatment of Postoperative Nausea and/or Vomiting

Adults

The recommended intravenous dosage of ANZEMET Injection (dolasetron mesylate injection) is 12.5 mg given as a single dose approximately 15 minutes before the cessation of anesthesia (prevention) or as soon as nausea or vomiting presents (treatment).

Pediatric Patients

The recommended intravenous dosage in pediatric patients 2 to 16 years of age is 0.35 mg/kg, with a maximum dose of 12.5 mg, given as a single dose approximately 15 minutes before the cessation of anesthesia or as soon as nausea or vomiting presents. Safety and effectiveness in pediatric patients under 2 years of age have not been established.

ANZEMET Injection (dolasetron mesylate injection) mixed in apple or apple-grape juice may be used for oral dosing of pediatric patients. When ANZEMET Injection (dolasetron mesylate injection) is administered orally, the recommended oral dosage in pediatric patients 2 to 16 years of age is 1.2 mg/kg up to a maximum 100-mg dose given within 2 hours before surgery. The diluted product may be kept up to 2 hours at room temperature before use.

Use in the Elderly, in Renal Failure Patients, or in Hepatically Impaired Patients

No dosage adjustment is recommended.

Administration

ANZEMET Injection (dolasetron mesylate injection) can be safely infused intravenously as rapidly as 100 mg/30 seconds or diluted in a compatible intravenous solution (see below) to 50 mL and infused over a period of up to 15 minutes. ANZEMET Injection (dolasetron mesylate injection) should not be mixed with other drugs. Flush the infusion line before and after administration of ANZEMET Injection (dolasetron mesylate injection) .

Stability

After dilution, ANZEMET Injection (dolasetron mesylate injection) is stable under normal lighting conditions at room temperature for 24 hours or under refrigeration for 48 hours with the following compatible intravenous fluids: 0.9% sodium chloride injection, 5% dextrose injection, 5% dextrose and 0.45% sodium chloride injection, 5% dextrose and Lactated Ringer’s injection, Lactated Ringer’s injection, and 10% mannitol injection. Although ANZEMET Injection (dolasetron mesylate injection) is chemically and physically stable when diluted as recommended, sterile precautions should be observed because diluents generally do not contain preservative. After dilution, do not use beyond 24 hours, or 48 hours if refrigerated.

Parenteral drug products should be inspected visually for particulate matter and discoloration before administration whenever solution and container permit.

HOW SUPPLIED

ANZEMET Injection (dolasetron mesylate injection) is supplied as a clear, colorless solution in single and multidose vials, and Carpuject® sterile cartridges with Luer Lock.

 

ANZEMET® Injection
(dolasetron mesylate injection)
20 mg/mL
Strength Description NDC Number
12.5 mg 12.5 mg 0.625mL single use vial* (Box of 6) 0088-1208-06
12.5 mg 0.625mL fill in single-use 2mL Carpuject with Luer Lock
(Box of 10)
0088-1208-76
100 mg/5 mL 5mL single-use vial* 0088-1206-32
500 mg/25 mL 25 mL multidose vial* 0088-1209-26

Store at 20-25°C (68-77°F) with excursions permitted to 15-30°C (59-86°F) [See USP Controlled Room Temperature]. Protect from light.

SIDE EFFECTS

Chemotherapy Patients

In controlled clinical trials, 2265 adult patients received ANZEMET Injection (dolasetron mesylate injection) . The overall adverse event rates were similar with 1.8 mg/kg ANZEMET Injection (dolasetron mesylate injection) and ondansetron or granisetron. Patients were receiving concurrent chemotherapy, predominantly high-dose (≥ 50 mg/m2) cisplatin. Following is a combined listing of all adverse events reported in ≥ 2% of patients in these controlled trials (Table 4).

TABLE 4. ADVERSE EVENTS ≥ 2% FROM CHEMOTHERAPY-INDUCED NAUSEA AND VOMITING STUDIES

 

Event ANZEMET Injection (dolasetron mesylate injection)
1.8 mg/kg
(n=695)
Ondansetron/
Granisetron*
(n=356)
Headache 169 (24.3%) 73 (20.5%)
Diarrhea 86 (12.4%) 25 (7.0%)
Fever 30 (4.3%) 18 (5.1%)
Fatigue 25 (3.6%) 12 (3.4%)
Hepatic Function Abnorma 25 (3.6%) 12 (3.4%)
Abdominal Pain 22 (3.2%) 7 (2.0%)
Hypertension 20 (2.9%) 9 (2.5%)
Pain 17 (2.4%) 7 (2.0%)
Dizziness 15 (2.2%) 7 (2.0%)
Chills/Shivering 14 (2.0%) 6 (1.7%)
*: Ondansetron 32 mg intravenous, granisetron 3 mg intravenous.
† : Includes events coded as SGOT- and/or SGPT-increased (see also Liver and Biliary System below)

Postoperative Patients

In controlled clinical trials with 2550 adult patients, headache and dizziness were reported more frequently with 12.5 mg ANZEMET Injection (dolasetron mesylate injection) than with placebo. Rates of other adverse events were similar. Following is a listing of all adverse events reported in ≥ 2% of patients receiving either placebo or 12.5 mg ANZEMET Injection (dolasetron mesylate injection) for the prevention or treatment of postoperative nausea and vomiting in controlled clinical trials (Table 5).

Table 5. Adverse Events ≥ 2% from Placebo-Controlled Postoperative Nausea and Vomiting Studies

 

Event ANZEMET Injection (dolasetron mesylate injection)
12.5 mg
(n=615)
Placebo
(n=739)
Headache 58 (9.4%) 51 (6.9%)
Dizziness 34 (5.5%) 23 (3.1%)
Drowsiness 15 (2.4%) 18 (2.4%)
Pain 15 (2.4%) 21 (2.8%)
Urinary Retention 12 (2.0%) 16 (2.2%)

In clinical trials, the following infrequently reported adverse events, assessed by investigators as treatment-related or causality unknown, occurred following oral or intravenous administration of ANZEMET to adult patients receiving concomitant cancer chemotherapy or surgery:

Cardiovascular: Hypotension; rarely – edema, peripheral edema. The following events also occurred rarely and with a similar frequency as placebo and/or active comparator: Mobitz I AV block, chest pain, orthostatic hypotension, myocardial ischemia, syncope, severe bradycardia, and palpitations. See PRECAUTIONS section for information on potential effects on ECG.

In addition, the following asymptomatic treatment-emergent ECG changes were seen at rates less than or equal to those for active or placebo controls: bradycardia, tachycardia, T wave change, ST-T wave change, sinus arrhythmia, extrasystole (APCs or VPCs), poor R-wave progression, bundle branch block (left and right), nodal arrhythmia, U wave change, atrial flutter/fibrillation.

Furthermore, severe hypotension, bradycardia and syncope have been reported immediately or closely following IV administration.

Dermatologic: Rash, increased sweating.

Gastrointestinal System: Constipation, dyspepsia, abdominal pain, anorexia; rarely – pancreatitis.

Hearing, Taste and Vision: Taste perversion, abnormal vision; rarely – tinnitus, photophobia.

Hematologic: Rarely – hematuria, epistaxis, prothrombin time prolonged, PTT increased, anemia, purpura/hematoma, thrombocytopenia.

Hypersensitivity: Rarely – anaphylactic reaction, facial edema, urticaria.

Liver and Biliary System: Transient increases in AST (SGOT) and/or ALT (SGPT) values have been reported as adverse events in less than 1% of adult patients receiving ANZEMET in clinical trials. The increases did not appear to be related to dose or duration of therapy and were not associated with symptomatic hepatic disease. Similar increases were seen with patients receiving active comparator. Rarely – hyperbilirubinemia, increased GGT.

Metabolic and Nutritional: Rarely – alkaline phosphatase increased.

Musculoskeletal: Rarely – myalgia, arthralgia.

Nervous System: Flushing, vertigo, paraesthesia, tremor; rarely – ataxia, twitching. Psychiatric: Agitation, sleep disorder, depersonalization; rarely – confusion, anxiety, abnormal dreaming.

Respiratory System: Rarely – dyspnea, bronchospasm.

Urinary System: Rarely – dysuria, polyuria, acute renal failure.

Vascular (Extracardiac): Local pain or burning on IV administration; rarely – peripheral ischemia, thrombophlebitis/phlebitis.

Postmarketing Experience:

There are rare reports of wide complex tachycardia or ventricular tachycardia and of ventricular fibrillation cardiac arrest following intravenous administration.

DRUG INTERACTIONS

The potential for clinically significant drug-drug interactions posed by dolasetron and hydrodolasetron appears to be low for drugs commonly used in chemotherapy or surgery, because hydrodolasetron is eliminated by multiple routes. See PRECAUTIONS, General for information about potential interaction with other drugs that prolong the QTc interval. Blood levels of hydrodolasetron increased 24% when dolasetron was coadministered with cimetidine (nonselective inhibitor of cytochrome P-450) for 7 days, and decreased 28% with coadministration of rifampin (potent inducer of cytochrome P-450) for 7 days. ANZEMET Injection (dolasetron mesylate injection) has been safely coadministered with drugs used in chemotherapy and surgery. As with other agents which prolong ECG intervals, caution should be exercised in patients taking drugs which prolong ECG intervals, particularly QTc.

In patients taking furosemide, nifedipine, diltiazem, ACE inhibitors, verapamil, glyburide, propranolol, and various chemotherapy agents, no effect was shown on the clearance of hydrodolasetron. Clearance of hydrodolasetron decreased by about 27% when dolasetron mesylate was administered intravenously concomitantly with atenolol. ANZEMET did not influence anesthesia recovery time in patients. Dolasetron mesylate did not inhibit the antitumor activity of four chemotherapeutic agents (cisplatin, 5-fluorouracil, doxorubicin, cyclophosphamide) in four murine models.

WARNINGS

ANZEMET can cause ECG interval changes (PR, QTc, JT prolongation and QRS widening). These changes are related in magnitude and frequency to blood levels of the active metabolite. These changes are self-limiting with declining blood levels. Some patients have interval prolongations for 24 hours or longer. Interval prolongation could lead to cardiovascular consequences, including heart block or cardiac arrhythmias. These have rarely been reported.

A cardiac conduction abnormality observed on an intra-operative cardiac rhythm monitor (interpreted as complete heart block) was reported in a 61-year-old woman who received 200 mg ANZEMET for the prevention of postoperative nausea and vomiting. This patient was also taking verapamil. A similar event also interpreted as complete heart block was reported in one patient receiving placebo. A 66-year-old man with Stage IV non-Hodgkins lymphoma died suddenly 6 hours after receiving 1.8 mg/kg (119 mg) intravenous ANZEMET Injection (dolasetron mesylate injection) . This patient had other potential risk factors including substantial exposure to doxorubicin and concomitant cyclophosphamide.

Pediatric Use

Dolasetron should be administered with caution in pediatric patients who have or may develop prolongation of cardiac conduction intervals, particularly QTc. Rare cases of sustained supraventricular and ventricular arrhythmias, cardiac arrest leading to death, and myocardial infarction have been reported in children and adolescents (See PRECAUTIONS, General, and ADVERSE REACTIONS – Postmarketing Experience).

PRECAUTIONS

General

Dolasetron should be administered with caution in patients who have or may develop prolongation of cardiac conduction intervals, particularly QTc. These include patients with hypokalemia or hypomagnesemia, patients taking diuretics with potential for inducing electrolyte abnormalities, patients with congenital QT syndrome, patients taking anti-arrhythmic drugs or other drugs which lead to QT prolongation, and cumulative high dose anthracycline therapy.

Cross hypersensitivity reactions have been reported in patients who received other selective 5-HT3 receptor antagonists. These reactions have not been seen with dolasetron mesylate.

Carcinogenesis, Mutagenesis, Impairment of Fertility

In a 24-month carcinogenicity study, there was a statistically significant (P< 0.001) increase in the incidence of combined hepatocellular adenomas and carcinomas in male mice treated with 150 mg/kg/day and above. In this study, mice (CD-1) were treated orally with dolasetron mesylate 75, 150 or 300 mg/kg/day (225, 450 or 900 mg/m2/day). For a 50 kg person of average height (1.46 m2 body surface area), these doses represent 3.4, 6.8 and 13.5 times the recommended clinical dose (66.6 mg/m2, intravenous) on a body surface area basis. No increase in liver tumors was observed at a dose of 75 mg/kg/day in male mice and at doses up to 300 mg/kg/day in female mice.

In a 24-month rat (Sprague-Dawley) carcinogenicity study, oral dolasetron mesylate was not tumorigenic at doses up to 150 mg/kg/day (900 mg/m2/day, 13.5 times the recommended human dose based on body surface area) in male rats and 300 mg/kg/day (1800 mg/m2/day, 27 times the recommended human dose based on body surface area) in female rats.

Dolasetron mesylate was not genotoxic in the Ames test, the rat lymphocyte chromosomal aberration test, the Chinese hamster ovary (CHO) cell (HGPRT) forward mutation test, the rat hepatocyte unscheduled DNA synthesis (UDS) test or the mouse micronucleus test.

Dolasetron mesylate was found to have no effect on fertility and reproductive performance at oral doses up to 100 mg/kg/day (600 mg/m2/day, 9 times the recommended human dose based on body surface area) in female rats and up to 400 mg/kg/day (2400 mg/m2/day, 36 times the recommended human dose based on body surface area) in male rats.

Pregnancy: Teratogenic Effects. Pregnancy Category B.

Teratology studies have not revealed evidence of impaired fertility or harm to the fetus due to dolasetron mesylate. These studies have been performed in pregnant rats at intravenous doses up to 60 mg/kg/day (5.4 times the recommended human dose based on body surface area) and pregnant rabbits at intravenous doses up to 20 mg/kg/day (3.2 times the recommended human dose based on body surface area). There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

Nursing Mothers

It is not known whether dolasetron mesylate is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when ANZEMET Injection (dolasetron mesylate injection) is administered to a nursing woman.

Pediatric Use

Dolasetron should be administered with caution in pediatric patients who have or may develop prolongation of cardiac conduction intervals, particularly QTc. Rare cases of sustained supraventricular and ventricular arrhythmias, cardiac arrest leading to death, and myocardial infarction have been reported in children and adolescents (See PRECAUTIONS, General, and ADVERSE REACTIONS -Postmarketing Experience).

Four open-label, noncomparative pharmacokinetic studies have been performed in a total of 108 pediatric patients receiving emetogenic chemotherapy or undergoing surgery with general anesthesia. These patients received ANZEMET Injection (dolasetron mesylate injection) either intravenously or orally in juice. Pediatric patients from 2 to 17 years of age participated in these trials, which included intravenous ANZEMET Injection (dolasetron mesylate injection) doses of 0.6, 1.2, 1.8, or 2.4 mg/kg, and oral doses of 0.6, 1.2, or 1.8 mg/kg. There is no experience in pediatric patients under 2 years of age. Overall, ANZEMET Injection (dolasetron mesylate injection) was well tolerated in these pediatric patients. Efficacy information collected in pediatric patients receiving cancer chemotherapy are consistent with those obtained in adults. No efficacy information was collected in the pediatric postoperative nausea and vomiting studies.

Geriatric Use

Prevention of cancer chemotherapy-induced nausea and vomiting (CINV)

In controlled clinical trials in the prevention of chemotherapy-induced nausea and vomiting, 723 (32%) of 2264 patients were 65 years of age or older. Of the 723 geriatric patients in the trial, 563 received intravenous ANZEMET Injection (dolasetron mesylate injection) . No overall differences in safety or effectiveness were observed between geriatric and younger patients, and other reported clinical experience has not identified differences in responses between geriatric and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

Prevention and treatment of post-operative nausea and vomiting (PONV)

Controlled clinical studies in the prevention and treatment of post-operative nausea and vomiting did not include sufficient numbers of patients aged 65 years or older — only 57 (2%) geriatric patients (43 received intravenous ANZEMET Injection (dolasetron mesylate injection) ) out of 3289 total patients participated in the controlled PONV trials — to determine whether they respond differently from younger patients. Other reported clinical experiences have not identified differences in responses between geriatric and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

The pharmacokinetics, including clearance of intravenous ANZEMET Injection (dolasetron mesylate injection) , in elderly and younger patients are similar (see CLINICAL PHARMACOLOGY, Pharmacokinetics in Humans). Dosage adjustment is not needed in patients over the age of 65.

OVERDOSE

A 59-year-old man with metastatic melanoma and no known pre-existing cardiac conditions developed severe hypotension and dizziness 40 minutes after receiving a 15 minute intravenous infusion of 1000 mg (13 mg/kg) of dolasetron mesylate. Treatment for the overdose consisted of infusion of 500 mL of a plasma expander, dopamine, and atropine. The patient had normal sinus rhythm and prolongation of PR, QRS and QTc intervals on an ECG recorded 2 hours after the infusion. The patient’s blood pressure was normal 3 hours after the event and the ECG intervals returned to baseline on follow-up. The patient was released from the hospital 6 hours after the event.

Following a suspected overdose of ANZEMET Injection (dolasetron mesylate injection) , a patient found to have second-degree or higher

AV conduction block with ECG should undergo cardiac telemetry monitoring.

There is no known specific antidote for dolasetron mesylate, and patients with suspected overdose should be managed with supportive therapy. Individual doses as large as 5 mg/kg intravenously or 400 mg orally have been safely given to healthy volunteers or cancer patients.

It is not known if dolasetron mesylate is removed by hemodialysis or peritoneal dialysis.

A 7-year-old boy received 6 mg/kg dolasetron mesylate orally before surgery. No symptoms occurred and no treatment was required.

Single intravenous doses of dolasetron mesylate at 160 mg/kg in male mice and 140 mg/kg in female mice and rats of both sexes (6.3 to 12.6 times the recommended human dose based on body surface area) were lethal. Symptoms of acute toxicity were tremors, depression and convulsions.

CONTRAINDICATIONS

ANZEMET Injection (dolasetron mesylate injection) is contraindicated in patients known to have hypersensitivity to the drug.

548 read