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