Cimetidine-Associated Thrombocytopenia

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Abstract
A case of thrombocytopenia associated with cimetidine administration in a 65-year-old white female with recurrent adenocarcinoma is reported. Her platelet count fell from 273 000/mm3 to 35 000/mm3 after cimetidine therapy was started. Upon discontinuation of cimetidine, the platelet count increased to 164000/mm3. Later in her hospital course, the patient again received cimetidine and her platelet count fell to 37 000/mm3. The patient was never leukopenic during her hospitalization. This is the only reported case of thrombocytopenia in the absence of leukopenia that is documented by a rechallenge with cimetidine.

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