NCIt definition : The hydrochloride salt form of guanfacine, a centrally acting alpha-2 adrenergic agonist
with antihypertensive activity. Alpha-2 receptor stimulation by guanfacine hydrochloride
results in a decreased sympathetic outflow from the vasomotor center to the heart,
kidneys, and peripheral vasculature. This leads to a decrease in heart rate and peripheral
vascular resistance. (NCI05);