Abstract
To the Editor: Danazol (Danocrine) is a synthetic androgen approved for use in the treatment of fibrocystic breast disorder, endometriosis, and hereditary angioedema. It has also been used in the treatment of chronic immune thrombocytopenic purpura (ITP).1 , 2 The mechanism of its action in ITP is unknown; presumably, it acts as an immune modulator. From 1979 through 1985, the Food and Drug Administration received four reports of thrombocytopenia after treatment with danazol. This letter summarizes those reports.The reports were received through the system for reporting adverse drug reactions. Four women (22 to 49 years of age; mean age, 36) were . . .

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