<prompt> Cimetidine inhibits the metabolism of all of the following drugs except.PhenytoinWarfarinKetoconazoleDiazepam  <response>: Ans. C KetoconazoleRef: KDT 8the p698Cimetidine is a potent inhibitor of microsomal enzymes. It prolongs the half lives of warfarin, theophylline, phenytoin, oral hypoglycemic agents, alcohol and benzodiazepines. 