Guanfacine is a medication primarily used to treat attention deficit hyperactivity disorder (ADHD) in children and adolescents. It works by affecting certain receptors in the brain, which helps improve focus, attention, and impulse control. Guanfacine can also be prescribed for high blood pressure, as it helps relax blood vessels and lower heart rate. This medication is available in both immediate-release and extended-release forms. Common side effects may include drowsiness, dry mouth, and fatigue. It is important for patients to follow their healthcare provider's instructions and report any unusual symptoms while taking guanfacine.