May enhance hypoglycemic effect w/ insulin prep, biguanides (eg, metformin), α-glucosidase inhibitors (eg, voglibose), insulin sensitizer (eg, pioglitazone HCl), salicylates (eg, aspirin), clofibrate, sulfanilamide (eg, sulfamethoxazole), β-adrenergic blocking agents (eg, propranolol), MAOIs, anabolic hormone (eg, mestanolone), tetracyclines (eg, tetracycline HCl, minocycline HCl). May reduce hypoglycemic effect w/ epinephrine, adrenocortical hormones (eg, methylprednisolone), ovarian hormones (eg, ethinylestradiol) & thyroid hormones, nicotinic acid, INH, pyrazinamide, phenothiazines (eg, chlorpromazine), diuretics (eg, thiazide, chlorthalidone,
ethacrynic acid), phenytoin, guanethidine sulphate.