Omeprazole-induced acute interstitial nephritis.

Omeprazole is a proton pump inhibitor widely used for the treatment of peptic ulcer disease. We report a patient presenting nonoliguric acute renal failure following omeprazole treatment. Both eosinophilia and eosinophiluria were observed, and the patient was diagnosed as having drug-induced acute interstitial nephritis. Renal failure spontaneously resolved when omeprazole was discontinued.