Medical Definition of guanfacine
: 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 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
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