Eflornithine (difluoromethyl ornithine, Ornidyl) is a unique antiprotozoal agent in that its mode of action involves inhibition of a specific enzyme, ornithine decar-boxylase. In eukaryotes, decarboxylation of ornithine is required for biosynthesis of polyamines, which are important in cell division and differentiation.

Eflornithine is given intravenously, and about 80% of the drug is excreted in the urine within 24 hours. It does not bind significantly to plasma proteins and has a terminal plasma half-life of about 3 hours. It crosses the blood-brain barrier and is one of the drugs of choice for treating the hemolymphatic and meningoencephalitic stage of T. brucei-gambiense. The most significant side effects are anemia and leukopenia. Oral therapy is associated with considerable gastrointestinal toxicity. Diarrhea, thrombocytopenia, and seizures are occasionally reported.

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