What is a sympathetic agonist?

sympathetic agonist definitionWhat is a sympathetic agonist?
It is a drug or chemical that acts to stimulate the sympathetic on edge system.
The sympathetic nervous system is part of the pack of the autonomic nervous system, and controls things resembling heart rate and blood vessels. Here is an smooth to understand site that explainsit:
http://faculty.washington.edu/chudler/au...
Sympathetic stimulation cause:
pupil dilation, increased heart rate, dry mouth and decreased digestion
It is the "combat or flight" response.
Hope that helps.
it's a drug that activate alpha or beta adrenergic receptors. the classic example is epinephrine.