The generic name of Betalucel is Metoprolol, and the efficacy of 25mg half tablet of Metoprolol can last for about 6 hours. 1. Metoprolol mainly acts on the β-receptors in the body, and its effect on the heart is to slow down myocardial contractility and heart rate, which can be used in the treatment of tachyarrhythmia, and at the same time, it has the effect of lowering blood pressure. The main clinical indications are hypertension, and can be used in the treatment of coronary heart disease and tachyarrhythmia. 2. Oral metoprolol can play a role after 1~2 hours, the half-life of the drug in 2~3 hours, 25mg half-piece of metoprolol is 12.5mg, the effect can last for about 6 hours, the need to take the drug 2~3 times a day. 3. The adverse reactions of the drug include clammy skin, dizziness, bradycardia, hypotension, nausea, dyspnea, etc. It is contraindicated in patients who are allergic to the components of the drug, bronchial asthma, second and third-degree atrioventricular block, cardiogenic shock, uncontrolled heart failure, and severe hypotension. Metoprolol should be used under the guidance of a physician, mastering the indications and contraindications of the drug, and arranging the method of administration according to the characteristics of the drug.