Potentiated blood sugar-lowering effect w/ insulin, oral antidiabetics, ACE inhibitors, allopurinol, anabolic steroids & male sex hormones, chloramphenicol, coumarin derivatives, cyclophosphamide, disopyramide, fenfluramine, fenyramidol, fibrates, fluoxetine, guanethidine, ifosfamide, MAOIs, miconazole, p-aminosalicylic acid, quinolones, salicylates, sulfinpyrazone, sulfonamides, tetracyclines, tritoqualine, trofosfamide. Weakened blood sugar-lowering effect w/ acetazolamide, barbiturates, corticosteroids, diazoxide, diuretics, epinephrine & other sympathomimetic agents, glucagons, laxatives (after protracted use), nicotinic acid (high dose), estrogens & progestogens, phenothiazines, phenytoin, rifampicin, thyroid hormones.
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