Phentolamine

**Definition:** A nonselective alpha-adrenergic antagonist. It 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.

**Tree numbers:** - D03.383.129.308.754

**Synonyms:** - Fentolamin