Acute interstitial nephritis after cocaine sniffing.

We report the case of a 42-year-old man who developed biopsy-confirmed acute interstitial nephritis (AIN) after cocaine sniffing. He required a few hemodialysis sessions but fully recovered within 3 weeks after cocaine withdrawal and a short course of corticosteroids. AIN should be recognized as a potential cause of acute renal failure in cocaine users, and a history of cocaine use should be carefully elicited in patients with unexplained AIN.