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Reversible pancytopenia was the main finding of inadvertent overdoses of chlorambucil. Neurological toxicity ranging from agitated behavior and ataxia to multiple grand mal seizures has also occurred. As there is no known antidote, the blood picture should be closely monitored and general supportive measures should be instituted, together with appropriate blood transfusions, if necessary. Chlorambucil is not dialyzable.
Oral LD50 single doses in mice are 123 mg/kg. In rats, a single intraperitoneal dose of 12.5 mg/kg of chlorambucil produces typical nitrogen-mustard effects; these include atrophy of the intestinal mucous membrane and lymphoid tissues, severe lymphopenia becoming maximal in 4 days, anemia, and thrombocytopenia. After this dose, the animals begin to recover within 3 days and appear normal in about a week, although the bone marrow may not become completely normal for about 3 weeks. An intraperitoneal dose of 18.5 mg/kg kills about 50% of the rats with development of convulsions. As much as 50 mg/kg has been given orally to rats as a single dose, with recovery. Such a dose causes bradycardia, excessive salivation, hematuria, convulsions, and respiratory dysfunction.
Chlorambucil should not be used in patients whose disease has demonstrated a prior resistance to the agent. Patients who have demonstrated hypersensitivity to chlorambucil should not be given the drug. There may be cross-hypersensitivity (skin rash) between chlorambucil and other alkylating agents.This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 11/10/2011
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