Metoprolol is used for a number of conditions, including angina, acute myocardial infarction, high blood pressure, supraventricular tachycardia, ventricular tachycardia, congestive heart failure, and prevention of migraine headaches. [5] It is an adjunct in the treatment of hyperthyroidism. [18] Both oral and intravenous forms of metoprolol are available for administration. [19] The different. Metoprolol is used to treat high blood pressure, angina (chest pain) and heart failure. Metoprolol also is used to improve survival after a heart attack. Metoprolol is in a class of medications called beta blockers. It works by relaxing blood vessels and slowing heart rate to improve blood flow and decrease blood pressure. Metoprolol may worsen the symptoms of heart failure in some patients. Check with your doctor right away if you are having chest pain or discomfort, dilated neck veins, extreme fatigue, irregular breathing or heartbeat, swelling of the face, fingers, feet, or lower legs, trouble breathing, or weight gain. Metoprolol Tablets Metoprolol (Lopressor®) is a medication that lowers your blood pressure and heart rate, making it easier for your heart to pump blood to the rest of your body. It treats high blood pressure. It also prevents chest pain or further damage after a heart attack. It’s a type of beta-blocker. Metoprolol is a drug called a beta-blocker. It’s used to treat conditions such as high blood pressure, heart failure, and angina (chest pain). Dosages of metoprolol may vary depending on the. Metoprolol is used to treat angina (chest pain) and hypertension (high blood pressure). Learn about side effects, interactions and indications. Metoprolol is a prescription medication used to treat the symptoms of Hypertension, Acute Myocardial Infarction, Congestive Heart Failure, Angina. Learn about side effects, dosages, drug interactions, and more. Learn about the side effects of metoprolol, from common to rare, for consumers and healthcare professionals. Find patient medical information for Metoprolol (Lopressor, Toprol XL, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Read on to learn about the side effects of metoprolol, including common, severe, and long-term side effects, and how to manage them.