Metoprolol is at a very high therapeutic level nowadays, classified as a beta-blocker, and has good indications inside many cardiovascular diseases. Its specific as follows: 1, the drug is one of the six hypotensive class of drugs, beta-blockers are also the most used, can synergistically lower blood pressure; 2, for rapid arrhythmias, can play the role of anti-arrhythmic, belong to the anti-arrhythmic class of drugs; 3, the treatment of coronary heart disease mainly betalactone class of drugs, mainly able to reduce myocardial oxygen consumption. Because the coronary arteries of patients with coronary artery disease will be ischemic and hypoxic, betalactam drugs can play a role in protecting the heart, but also to inhibit myocardial stress; 4, can be used for cardiac insufficiency, cardiac insufficiency of patients in the early stage, especially in acute left failure, is not suitable for the use of beta-blockers, but now patients with cardiac insufficiency is also suitable for the use of beta-blockers, its main is a long-term However, beta-blockers are now also suitable for patients with cardiac insufficiency. In summary, beta-blockers are excellent drugs in the cardiovascular field. Metoprolol succinate is somewhat different from the previous betalac, it belongs to the extended release dosage form, which can make the blood concentration maintained more stable for a day, the previous betalac is valid for 12 hours, and it needs to be administered twice a day, but metoprolol succinate only needs to take one a day, it can maintain the effect of a day, so it is a class of drugs that is recommended and worth to be used more often.