Phentolamine is an adrenergic receptor antagonist and peripheral vasodilator.
It is used to prevent and treat hypertension due to pheochromocytomain and
to control cutaneous necrosis and sloughing when extravasation of norepinephrine.
It is chemically described as m-[N-(2-lmidazolin-2-ylmethyl)-p-toluidino] phenol
or 2-(N-[m-Hydroxyphenyl]