METOPROLOL (me TOE proe lole) treats high blood pressure. It also prevents chest pain (angina) or further damage after a heart attack. It works by lowering your blood pressure and heart rate, making it easier for your heart to pump blood to the rest of your body. It belongs to a group of medications called beta blockers. 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. TOPROL-XL, metoprolol succinate, is a beta1-selective (cardioselective) adrenoceptor blocking agent, for oral administration, available as extended release tablets. TOPROL-XL has been. TOPROL-XL, metoprolol succinate, is a beta 1 -selective (cardioselective) adrenoceptor blocking agent, for oral administration, available as extended-release tablets. TOPROL-XL has been formulated to provide a controlled and predictable release of metoprolol for once-daily administration. Metoprolol works by blocking the effect of adrenaline and noradrenaline on beta-1 receptors in your heart. This slows your heart rate, reduces how hard your heart squeezes, and lowers your blood pressure. Because the heart is doing less work, it needs less oxygen, which is why metoprolol also helps with angina. 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. Metoprolol (Lopressor) is a beta blocker that treats high blood pressure and other heart conditions. The most common side effects of metoprolol are dizziness, tiredness, and diarrhea. Other metoprolol side effects include itchiness and depression. Metoprolol succinate (Toprol XL) is used to treat hypertension and to control chronic (long-term) chest pain. It's also used to lower the risk for hospitalization and death in people with heart failure. Toprol-XL is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Toprol-XL is used to treat angina (chest pain) and hypertension (high blood pressure). Metoprolol, sold under the brand names Lopressor and Toprol-XL among others, is a medication used to treat angina, high blood pressure and a number of conditions involving an abnormally fast heart rate. [5].