CHLORPROPAMIDE, CLOFIBRATE, CARBAMAZEPINE, FLUDROCORTISONE, UREA, TRICYCLIC ANTIDEPRESSANTS, LITHIUM, HEPARIN, DEMECLOCYCLINE, NORADRENALINE, AND ALCOHOL MAY DECREASE THE ANTIDIURETIC EFFECT. GANGLION-BLOCKING AGENTS MAY INCREASE SENSITIVITY TO THE PRESSOR EFFECTS OF DEMOPRESSIN.