<unk>  is a vasodilator and alpha-adrenergic blocker that is FDA approved for the treatment of pheochromocytoma, to control episodes of hypertension and sweating..   Common adverse reactions include hypotension, tachyarrhythmia, nausea, vomiting, xerostomia, dizziness, somnolence, miosis, nasal congestion, and fatigue.
Phenoxybenzamine
Phenylephrine 
Penbutolol
Tertatolol
Phentolamine
Nicergoline
Methylergonovine 
Nadolol 