What are alpha adrenergic blocking agents?

Phenoxybenzamine (non selective) Phentolamine (non selective) Prazocin, doxazocin, alfuzocin, tamsulosin (α1 selective) Yohimbine (α2 selective) drugs that block α-adrenoceptors profoundly affect blood pressure blockade of these receptors reduces the sympathetic tone of the blood vessels, resulting in decreased peripheral vascular resistance. this induces a reflex tachycardia resulting from the lowered blood pressure phenoxybenzamine and phentolamine have limited clinical applications