Enhanced effect by oral antidiabetics, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates & sulphonamides. Reduced effect by corticosteroids, danazol, diazoxide, diuretics, glucagon, INH, oestrogens & progestogens, phenothiazine derivatives, somatropin; sympathomimetics eg, epinephrine, salbutamol, terbutaline; thyroid hormones, atypical antipsychotics eg, clozapine, olanzapine; PIs. Potentiated or weakened effect by β-blockers, clonidine, lithium salts or alcohol; pentamidine. Reduced or absent adrenergic counterregulation w/ β-blockers, clonidine, guanethidine & reserpine.