NCIt definition : Natural or synthetic Alpha-adrenergic Agonists selectively bind to and activate alpha
adrenergic receptors of the sympathetic nervous system, mimicking the actions of natural
sympathomimetic neurotransmitters (norepinephrine and related substances). Alpha-adrenergic
Agonists can initiate physiological responses such as vasoconstriction, pupil dilation,
and contraction of pilomotor muscles. (NCI04);