<prompt> cimetidine inhibits the metabolism of all the following drugs except:phenytoinwarfarinketoconazolediazepam  <response>: 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 6e p630 