Alpha receptor agonists are substances that activate the sympathetic nervous system by stimulation of alpha receptors, similar to the effects of epinephrine and norepinephrine. Alpha receptors are ...

Alpha blockers are substances that antagonize alpha receptors which are located primarily in smooth muscle. This acts to vasodilate in the arterial system and, thus, these agents are used to treat ...

It's not the only blood pressure medication recall to happen in recent months, but the FDA's concern appears to follow a common theme.

Epinephrine 0.15mg (1:2000); prefilled auto-injector; contains sulfites. Epinephrine acts on both alpha- and beta-adrenergic receptors. Through its action on alpha-adrenergic receptors ...