Increased blood glucose lowering effect & susceptibility to hypoglycemia w/ antihyperglycemics, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates, sulfonamides. Reduced blood glucose lowering effect w/ corticosteroids, danazol, diazoxide, diuretics, sympathomimetics (eg, epinephrine, salbutamol, terbutaline), glucagon, INH, phenothiazine derivatives, somatropin, thyroid hormones, estrogens & progestogens (eg, OCs), PIs & atypical antipsychotics (eg, olanzapine & clozapine). Either potentiated or weakened blood glucose lowering effect w/ β-blockers, clonidine, lithium salts & alcohol. Hypo-/hyperglycemia w/ pentamidine. Reduced or absence of adrenergic counter-regulation signs w/ sympatholytics eg, β-blockers, clonidine, guanethidine & reserpine.