Granulomatous tubulointerstitial nephritis secondary to omeprazole

Drug-induced interstitial nephritis is a common cause of acute kidney injury indicated by elevated serum creatinine. We report a case of omeprazole-induced acute granulomatous interstitial nephritis (GIN). Our patient developed acute GIN secondary to omeprazole ingestion requiring haemodialysis. Treatment with steroids and withdrawal of omperazole was successful allowing the patient to discontinue haemodialysis in 3 months. She remains dialysis free with chronic kidney disease stage IV, reflected by a serum creatine of 191 μmol/L and estimated glomerular filtration rate of 23 mL/min/1.73 m(2) at 5 years on follow-up.