We report a case of ciprofloxacin-related allergic tubulointerstitial nephritis, which manifested as nonoliguric renal failure, eosinophilia, and eosinophiluria. Our patient responded to discontinuation of ciprofloxacin therapy and oral administration of a brief course of corticosteroids. Although rare, allergic tubulointerstitial nephritis apparently can be caused by ciprofloxacin therapy. Clinicians should be aware of this entity.
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