... nonselective alpha-adrenergic antagonist. It is used in the treatment of hypertension and Name: ... , Phentolamine hydrochloride, Phentolamine.A nonselective alpha-adrenergic antagonist. It is used in the treatment of hypertension and hypertensive emergencies, pheochromocytoma ... withdrawal syndrome, impotence, and peripheral vascular disease Phentolamine (It is used in the treatment of hypertension)