cimetidine inhibits the metabolism of all the following drugs except:: (A) phenytoin, (B) warfarin, (C) ketoconazole, (D) diazepam
Answer is C. cimetidine is a potent inhibitor of.microsomal enzymes.it prolongs the half life of warfarin, theophyllin ,phenytoin,oral hypoglycemic agents ,alcohol and benzidiazepines.(ref KDT 6/e p630)