SALICYLATES, NSAIDS, SULPHONAMIDES, CHLORAMPHENICOL, PROBENECID, COUMARINS, ACE INHIBITORS, TRICYCLIC ANTIDEPRESSANTS, MAOIS AND BETA BLOCKERS POTENTIATES THE ACTION AND MAY CAUSE HYPOGLYCAEMIA. ORAL CONTRACEPTIVES ANTAGONISE INSULIN ACTION. THIAZIDE DIURETICS REDUCE INSULIN RELEASE, CA++CHANNEL BLOCKERS DECREASES THE ACTION OF TOLAZAMIDE AND MAY CAUSE HYPERGLYCAEMIA. BARBITURATES MAY PRODUCE DISULFIRAM LIKE ACTION.