Oral antidiabetic agents, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates & sulfonamide antibiotics may enhance the blood-glucose-lowering effect & increase susceptibility to hypoglycemia. Corticosteroids, danazol, diazoxide, diuretics, glucagon, INH, estrogens & progestogens, phenothiazine derivatives, somatropin, sympathomimetic agents (eg, epinephrine (adrenaline), salbutamol, terbutaline), & thyroid hormones may reduce blood glucose-lowering effect. β-blockers, clonidine, lithium salts or alcohol may either potentiate or weaken blood-glucose-lowering effect. Pentamidine may cause hypoglycemia, which may be followed by hyperglycemia. Signs of adrenergic counter-regulation may be reduced or absent w/ sympathomimetics eg, β-blockers, clonidine, guanethidine & reserpin.