Metoprolol succinate extended release tablets and metoprolol tartrate tablets, both drugs are beta-blockers, applied to tachyarrhythmias, coronary heart disease, heart failure, hypertension, etc. Both have the same side effects, the difference is that the dosage forms of the two drugs are different, and the number of doses taken and the time to maintain the therapeutic effect are also different. Metoprolol succinate extended-release tablets, containing extended-release capsules, can be released gradually according to the situation to ensure that the blood concentration is maintained at a high level, the blood concentration can reach more than 20 hours, and maintain the therapeutic effect can also reach more than 20 hours, this drug can be taken orally once a day. Metoprolol tartrate, with a relatively short half-life, needs to be taken several times a day, a daily dose of 2-3 times is the most common, and the daily dosing time is also approximate.