Question: what is alpha 1 agonist?
Answer: Alpha-adrenoceptor agonists (α-agonists) bind to α-receptors on vascular smooth muscle and induce smooth contraction and vasoconstriction, thus mimicking the effects of sympathetic adrenergic nerve activation to the blood vessels. ... The α1-adrenoceptors are the predominant α-receptor located on vascular smooth muscle.