Guanfacine is a medication used to treat high blood pressure and attention deficit hyperactivity disorder (ADHD) ). It is available in tablet and extended-release tablet forms, and is taken orally. Guanfacine is in a class of medications called centrally acting alpha2A-adrenergic receptor agonists, and it treats high blood pressure by decreasing heart rate and relaxing blood vessels so that blood can flow more easily through the body. For ADHD, guanfacine is thought to affect receptors in the parts of the brain that lead to strengthening working memory, reducing distraction, and improving attention and impulse control. It is used in addition to non-medication treatments to manage ADHD symptoms). The starting dosage of guanfacine is 1 mg per day, and the dosage can be titrated up in increments of 1 mg per week to a maximum dosage of 4 mg per day. It may take several weeks before the full benefits of the medication are noticed).