Potentiation of hypoglycemic effect w/ alcohol, β-blockers, bezafibrate, biguanides, chloramphenicol, clofibrate, coumarin derivatives, MAOIs, salicylates & tetracyclines. Attenuation & aggravation of metabolic state by laxatives, corticosteroids, nicotinic acid, estrogens, phenothiazine derivatives, saluretics, sympathomimetics, thyroid hormones.