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A Dapsone‐induced Blood Dyscrasia in the Mouse: Evidence for the Role of an Active Metabolite

In the female mouse, dapsone (50–500 mg kg−1, p.o.) caused a dose‐related methaemoglobinaemia which peaked at 0ṁ5‐1 h with recovery to baseline values occurring by 4h. Cimetidine (100 mg kg−1, p.o.), a known inhibitor of several hepatic P450 isozymes administered 1 h before dapsone, prevented the methaemoglobinaemia. In‐vitro, dapsone required activation by mouse hepatic microsomes to cause methaemoglobin formation in mouse erythrocytes and cytotoxicity to human mononuclear leucocytes. In both instances, the toxic effects were markedly reduced by cimetidine. Daily dosing of mice with dapsone (50 mg kg−1, p.o.) for 3 weeks induced a blood dyscrasia, characterized by a fall of platelet and white blood cell counts, which was inhibited by cimetidine (100 mg kg−1, p.o. daily).