Metoprolol tartrate tablets can inhibit beta-adrenergic receptors, which can play a role in slowing down the heart rate, lowering blood pressure, reducing cardiac output, reducing myocardial oxygen consumption, etc. It is mainly used in the treatment of hypertension, coronary heart disease, heart failure in compensatory period and tachyarrhythmia and other cardiovascular diseases. Adverse reactions include dizziness, headache, bradycardia, abdominal distension, nausea and vomiting. Contraindications include cardiogenic shock. Sick sinus node syndrome, second and third degree AV block. Patients with unstable, decompensated heart failure (pulmonary edema, hypoperfusion, or hypotension) who are continuously or intermittently treated with an agonist orthostatic agent. Symptomatic bradycardia or hypotension. In addition, metoprolol tartrate should not be given to patients with suspected acute myocardial infarction who have a heart rate of 45 beats/min, a p-q interval of 0.24 seconds, or a systolic blood pressure of 100 mmhg. Patients with severe peripheral vascular disease with risk of gangrene. Allergy is prohibited. The use of the drug needs to be applied under the guidance of a doctor and should not be abused.