... A nonselective alpha-adrenergic antagonist. It is used in the treatment of hypertension and Name: Phentolamine mesilate, Phentolamine mesylate, Phentolamine hcl, Phentolamine ... is used in the treatment of hypertension and hypertensive emergencies, pheochromocytoma, vasospasm of raynaud disease and frostbite, clonidine withdrawal syndrome, impotence, and peripheral vascular disease Phentolamine ...