Guanfacine is a medication primarily used to treat attention deficit hyperactivity disorder (ADHD) and high blood pressure. It works by affecting certain receptors in the brain, which helps improve focus and reduce impulsivity in individuals with ADHD. This medication can be prescribed alone or in combination with other treatments. 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.