USE:Drugs that bind to and block the activation of adrenergic beta-1 receptors- Drugs used in the treatment of acute or chronic vascular hypertension regardless of pharmacological mechanism Among the antihypertensive agents are diuretics(especially diuretics thiazide)adrenergic beta-antagonists adrenergic alpha-antagontsts angiotensin-converting enzyme inhibitors calcuium channel blockers ganglionic blockers and vasodilator agents Drugs used to cause dilation of the blood vessels