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Arch Intern Med. 2004;164:218-220.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Many drugs can induce antibodies that are capable of causing severe thrombocytopenia.^1-2 Quinine is the oldest recognized cause of this condition, which was first described in the late 19th century.³ Although quinine has been supplanted by other drugs as a treatment for malaria, it continues to be a major cause of drug-induced thrombocytopenia because of its use for the prevention of nocturnal leg cramps.^4-5 Because of concern about drug-induced thrombocytopenia and other adverse effects, the Food and Drug Administration banned over-the-counter use of quinine in 1994,⁶ and recommended against its use even by prescription in 1995.⁷ Nonetheless, a number of quinine-containing products are still available,⁸ and adverse reactions continue to be reported.^1-2 Quinidine, a structural isomer of quinine, is probably just as immunogenic, but cases of quinidine-related drug-induced thrombocytopenia have waned in recent years as its use for cardiac arrhythmias has declined. When a patient taking any medication, but especially . . . [Full Text of this Article]

Report of Cases.


Comment.
Josina C. Reddy, MD, PhD; Marc A. Shuman, MD
San Francisco

Richard H. Aster, MD
Milwaukee, Wis

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