Carvedilol belongs to a class of drugs known as alpha and beta blockers. It is used to treat high blood pressure and heart failure. It is also used after a heart attack to improve the chance of survival if the heart is not pumping well. Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. This drug works by blocking the action of certain natural substances in the body, such as epinephrine, on the heart and blood vessels. This effect lowers the heart rate, blood pressure, and strain on the heart.