Disulfiram-like reaction w/ alcohol. Increased anticoagulant effects w/ coumarin- or indandione-derivative anticoagulants. Potentiated hypoglycaemic action w/ sulphonamides, salicylates, phenylbutazone, β-adrenoreceptor blockers, MAOIs, ketoconazole, miconazole. Diminution of hypoglycaemic action w/ thiazide diuretics, corticosteroids, oestrogens.