Zopiclone-induced acute interstitial nephritis.

Zopiclone, a relatively new nonbenzodiazepine short-acting hypnotic medication is prescribed frequently for insomnia. The authors report a case of zopiclone-induced acute interstitial nephritis in a young, otherwise healthy man. The patient presented with anuric acute renal failure requiring hemodialysis. Kidney biopsy results showed acute interstitial nephritis with a prominent eosinophilic infiltrate in the interstitium. He recovered his renal function after stopping the medication and receiving corticosteroids.