Overview: Metoprolol is a beta blocker. It is is used to treat high blood pressure, chest pain, heart failure, and lower the risk of a repeat heart attack. Common side effects include tiredness. Metoprolol tartrate is a prescription beta-blocker used primarily to treat high blood pressure, chest pain from angina, and heart failure. It works by selectively blocking beta-1 receptors in the heart, which slows the heart rate, reduces the force of each heartbeat, and lowers blood pressure. Easy-to-read patient tips for metoprolol-tartrate covering how it works, benefits, risks, and best practices. Metoprolol is used alone or together with other medicines to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. Lopressor (metoprolol tartrate) Tablets and Injection is a selective beta-adrenoreceptor blocking agent (beta-blocker) used to treat high blood presure (hypertension), angina, and heart attacks. Learn about metoprolol tartrate (Lopressor) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Acute Myocardial Infarction Metoprolol tartrate is used orally and IV to reduce the risk of cardiovascular mortality in hemodynamically stable patients with definite or suspected acute MI. The term MI is used when there is evidence of myocardial necrosis in the setting of acute myocardial ischemia. [807] Metoprolol tartrate is the immediate-release version of metoprolol, a commonly prescribed cardioselective beta blocker. Used for blood pressure or heart problems, metoprolol tartrate works by slowing the heart and reducing the force of its contractions. Metoprolol tartrate is used in people whose blood pressure and circulation are stable after a definite or suspected heart attack, to reduce the risk of dying from heart and blood vessel causes. In hospital, it may be started as an injection into a vein and then continued as 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.