A drug used to treat high blood pressure and certain heart problems. It is also being studied in the prevention and treatment of side effects caused by some anticancer drugs. Carvedilol phosphate blocks certain receptors on nerve cells and causes blood vessels to dilate (widen). It is a type of antihypertensive agent and a type of antianginal agent.

The phosphate salt form of carvedilol, a racemic mixture and adrenergic blocking agent with antihypertensive activity and devoid of intrinsic sympathomimetic activity. The S enantiomer of carvedilol nonselectively binds to and blocks beta-adrenergic receptors, thereby exerting negative inotropic and chronotropic effects, and leading to a reduction in cardiac output. In addition, both enantiomers of carvedilol bind to and block alpha 1-adrenergic receptors, thereby causing vasodilation and reducing peripheral vascular resistance.