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. 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 is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Metoprolol is used to treat angina (chest pain) and hypertension (high blood pressure). 美托洛尔. 美托洛爾[5][6] （INN：metoprolol）又稱 美托普洛[7]，旧名 美多心安[8]，是一種選擇性的 β 1 -受體阻斷劑 [9]，用於治療 高血壓 、 心绞痛，還有一些與 心搏过速 有關的病徵（室上性心动过速、室性心律失常等） [9]。 Learn about the side effects of metoprolol, from common to rare, for consumers and healthcare professionals. 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. Metoprolol 是一种具有口服活性的、选择性的 β1-肾上腺素受体 (β1-adrenoceptor) 拮抗剂。 Metoprolol 具有抗炎、抗肿瘤和抗血管生成的特性。 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 英文别名： (2R)-metoprolol; d-Metoprolol; (R)-metoprolol; (R)-1- isopropyl amino-3- [4- (2-metoxyethyl)phenoxy]propan-2-ol; (+)-Metoprolol；Metoprolol；MET；Lopreser；Seloken；Betaloc；Lopresor；Betaloc；Seloken CAS号：81024-43-3 分子式：C15H25NO3 结构式： 美托洛尔的化学结构式 分子量：267.36400 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].