Azathioprine-induced alopecia: a rare adverse event, early marker of myelotoxicity.

Though not exempt from adverse events, azathioprine (AZA) is an inexpensive and effective drug in the induction and maintenance treatment of patients with inflammatory bowel disease. We present the case of a 20-year-old female patient with left-side ulcerative colitis in whom AZA was started at a dose of 1.5 mg/kg/day due to dependence on corticoids (thiopurine methyltransferase activity: 14.