Increased blood-sugar-lowering effect & susceptibility to hypoglycaemia w/ oral antidiabetics, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates, or sulfonamide antibiotics. Decreased blood-sugar-lowering effect w/ corticosteroids, danazol, diazoxide, diuretics, glucagon, INH, oestrogens & progestogens (eg, OCs), phenothiazine derivatives, somatropin, sympathomimetic agents (eg, epinephrine, salbutamol, terbutaline), thyroid hormones, atypical antipsychotics (eg, clozapine & olanzapine) & PIs. Either potentiated or weakened blood-sugar-lowering effect w/ β-blockers, clonidine, lithium salts or alcohol. Hypo-/hyperglycaemia w/ pentamidine. Weakened or suppressed warning symptoms of hypoglycaemic reaction w/ β-blockers, other sympatholytics eg, clonidine, guanethidine, reserpine.