Abstract
A 32-year-old male patient had three episodes of acute renal failure between January, 1968, and January, 1970. He recovered from the attacks, but their cause was not determined. The results of renal biopsies performed on two occasions were compatible with acute tubular necrosis. In October, 1970, another episode similar to the previous ones began but did not progress to established renal failure. Each episode was precipitated by phenazone hypersensitivity. Since the discovery of this allergy the patient has been completely well. The possibility of drug allergies should always be investigated in cases of acute renal failure of unknown origin.
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