Metoprolol is a prescription medication used to treat high blood pressure, angina (chest pain), congestive heart failure, and to improve survival after a heart attack. Metoprolol belongs to a group of drugs called beta blockers, which work by relaxing blood vessels and slowing heart rate. This improves blood flow and decreases overall blood pressure.

This medication comes in tablet and in an injectable form (metoprolol tartrate). The tablet is taken once or twice daily. The injectable form is given directly into a vein (IV) by a healthcare professional.

Metoprolol also comes in an extended-release tablet (metoprolol succinate). The extended-release tablet is taken once a day.

Common side effects of metoprolol include fatigue, tiredness, and shortness of breath. Metoprolol can cause drowsiness. Do not drive or operate heavy machinery until you know how metoprolol affects you.