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DESCRIPTIONDacarbazine for Injection USP is a white to an ivory colored solid which is light sensitive. Each 20 mL vial contains 200 mg of dacarbazine, USP (active ingredient). Each vial also contains anhydrous citric acid and mannitol. Dacarbazine for Injection USP is reconstituted and administered intravenously (pH 3.0 to 4.0). Dacarbazine for Injection USP is an anticancer agent. Chemically, Dacarbazine for Injection USP is 5-(3,3-Dimethyl-1-triazeno) imidazole-4-carboxamide (dacarbazine) with the following structural formula:
CLINICAL PHARMACOLOGYAfter intravenous administration of dacarbazine for injection, the volume of distribution exceeds total body water content suggesting localization in some body tissue, probably the liver. Its disappearance from the plasma is biphasic with initial half-life of 19 minutes and a terminal half-life of 5 hours.1 In a patient with renal and hepatic dysfunctions, the half-lives were lengthened to 55 minutes and 7.2 hours.1 The average cumulative excretion of unchanged dacarbazine in the urine is 40% of the injected dose in 6 hours.1
Dacarbazine is subject to renal tubular secretion rather than glomerular filtration. At therapeutic concentrations dacarbazine is not appreciably bound to human plasma protein.
In man, dacarbazine is extensively degraded. Besides unchanged dacarbazine, 5-aminoimidazole -4 carboxamide (AIC) is a major metabolite of dacarbazine excreted in the urine. AIC is not derived endogenously but from the injected dacarbazine, because the administration of radioactive dacarbazine labeled with 14C in the imidazole portion of the molecule (dacarbazine-2-14C) gives rise to AIC-2-14C.1
Although the exact mechanism of action of dacarbazine for injection is not known, three hypotheses have been offered:
1.Inhibition of DNA synthesis by acting as a purine analog2.Action as an alkylating agent3.Interaction with SH groups
INDICATIONS AND USAGEDacarbazine for Injection USP is indicated in the treatment of metastatic malignant melanoma. In addition, Dacarbazine for Injection USP is also indicated for Hodgkin's disease as a secondary-line therapy when used in combination with other effective agents.
CONTRAINDICATIONSDacarbazine for injection is contraindicated in patients who have demonstrated a hypersensitivity to it in the past.
WARNINGSHemopoietic depression is the most common toxicity with dacarbazine for injection and involves primarily the leukocytes and platelets, although anemia may sometimes occur. Leukopenia and thrombocytopenia may be severe enough to cause death. The possible bone marrow depression requires careful monitoring of white blood cells, red blood cells, and platelet levels. Hemopoietic toxicity may warrant temporary suspension or cessation of therapy with dacarbazine for injection.
Hepatic toxicity accompanied by hepatic vein thrombosis and hepatocellular necrosis resulting in death, has been reported. The incidence of such reactions has been low; approximately 0.01% of patients treated. This toxicity has been observed mostly when dacarbazine for injection has been administered concomitantly with other anti-neoplastic drugs; however, it has also been reported in some patients treated with dacarbazine for injection alone.
Anaphylaxis can occur following the administration of dacarbazine for injection.
PRECAUTIONSHospitalization is not always necessary but adequate laboratory study capability must be available. Extravasation of the drug subcutaneously during intravenous administration may result in tissue damage and severe pain. Local pain, burning sensation, and irritation at the site of injection may be relieved by locally applied hot packs.
Carcinogenicity of dacarbazine was studied in rats and mice. Proliferative endocardial lesions, including fibrosarcomas and sarcomas were induced by dacarbazine in rats. In mice, administration of dacarbazine resulted in the induction of angiosarcomas of the spleen.
PregnancyTeratogenic Effects, Pregnancy Category C
Dacarbazine for injection has been shown to be teratogenic in rats when given in doses 20 times the human daily dose on day 12 of gestation. Dacarbazine when administered in 10 times the human daily dose to male rats (twice weekly for 9 weeks) did not affect the male libido, although female rats mated to male rats had higher incidence of resorptions than controls. In rabbits, dacarbazine daily dose 7 times the human daily dose given on days 6 to 15 of gestation resulted in fetal skeletal anomalies. There are no adequate and well controlled studies in pregnant women. Dacarbazine for injection should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for tumorigenicity shown for dacarbazine for injection in animal studies, 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.
ADVERSE REACTIONSSymptoms of anorexia, nausea, and vomiting are the most frequently noted of all toxic reactions. Over 90% of patients are affected with the initial few doses. The vomiting lasts 1 to 12 hours and is incompletely and unpredictably palliated with phenobarbital and/or prochlorperazine. Rarely, intractable nausea and vomiting have necessitated discontinuance of therapy with dacarbazine for injection. Rarely, dacarbazine for injection has caused diarrhea. Some helpful suggestions include restricting the patient's oral intake of food for 4 to 6 hours prior to treatment. The rapid toleration of these symptoms suggests that a central nervous system mechanism may be involved, and usually these symptoms subside after the first 1 or 2 days.
There are a number of minor toxicities that are infrequently noted. Patients have experienced an influenza-like syndrome of fever to 39°C, myalgias and malaise. These symptoms occur usually after large single doses, may last for several days, and they may occur with successive treatments.
Alopecia has been noted as has facial flushing and facial paresthesia. There have been few reports of significant liver or renal function test abnormalities in man. However, these abnormalities have been observed more frequently in animal studies.
Erythematous and urticarial rashes have been observed infrequently after administration of dacarbazine for injection. Rarely, photosensitivity reactions may occur.
OVERDOSAGEGive supportive treatment and monitor blood cell counts.
DOSAGE AND ADMINISTRATIONMalignant MelanomaThe recommended dosage is 2 to 4.5 mg/kg/day for 10 days. Treatment may be repeated at 4 week intervals.2
An alternate recommended dosage is 250 mg/square meter body surface/day IV for 5 days. Treatment may be repeated every 3 weeks.3, 4