guanfacine

noun

guan·​fa·​cine ˈgwän-fə-ˌsēn 

: a drug that is an alpha-adrenergic agonist taken orally in the form of its hydrochloride C₉H₉Cl₂N₃O·HCl especially to treat hypertension and attention deficit hyperactivity disorder

Approved by the US Food and Drug Administration (FDA) for the treatment of attention-deficit/hyperactivity disorder (ADHD), guanfacine is also in widespread use for Tourette syndrome and oppositional defiance disorder …

—M. J. Friedrich, The Journal of the American Medical Association

Note: Guanfacine is marketed under the trademarks Intuniv and Tenex.