In addition to taking medication, making lifestyle changes will also help to control your blood pressure. Damage to these organs may cause heart disease, a heart attack, heart failure, stroke, kidney failure, loss of vision, and other problems. High blood pressure is a common condition and when not treated, can cause damage to the brain, heart, blood vessels, kidneys and other parts of the body. It works by relaxing blood vessels and slowing heart rate to improve blood flow and decrease blood pressure. Metoprolol is in a class of medications called beta blockers. Metoprolol also is used in combination with other medications to treat heart failure. Metoprolol is also used to improve survival after a heart attack. It also is used to treat chronic (long-term) angina (chest pain). Metoprolol is used alone or in combination with other medications to treat high blood pressure.