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, 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] 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 Lopressor (metoprolol tartrate) is an immediate-release form that disperses quickly, with 50% of the drug typically leaving your body in three to seven hours. Extended-release versions of metoprolol succinate, such as Toprol XL and Kaspargo Sprinkle, provide a steady release over 24 hours. 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. 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 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 (Lopressor, Toprol XL) is a prescription drug used to treat high blood pressure, angina, abnormal rhythms of the heart, and some neurological conditions. 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 (brand names Lopressor, Toprol XL, and Kapspargo) is a beta blocker prescribed to help lower blood pressure, reduce chest pain, and increase your chances of survival in people with heart failure or after a heart attack.