Guansacine is a medication primarily used as an antihypertensive agent. It functions as an alpha-2 adrenergic agonist, which helps to lower blood pressure by decreasing sympathetic outflow and reducing peripheral resistance. Though it has been used in the treatment of hypertension, guansacine is less commonly prescribed today compared to other antihypertensive medications. Its usage may be limited due to side effects and the availability of newer, more effective drugs.