ANTIDIURETIC EFFECT IS ENHANCED WITH CHLORPROPAMIDE, CLOFIBRATE, CARBAMAZEPINE, FLUDROCORTISONE, UREA AND TRICYCLIC ANTIDEPRESSANTS. LITHIUM ,HEPARIN, DEMECLOCYCLINE, NORADRENALINE, ALCOHOL MAY DECREASE THE ANTIDIURETIC EFFECT. GANGLION BLOCKING DRUGS MAY INCREASE SENSTIVITY TO THE PRESSOR EFFECTS OF VASOPRESSIN.