Metoprolol Succinate Extended-Release Tablets is a western medicine that is a selective beta1-blocker and is indicated for the treatment of high blood pressure, angina pectoris, and other conditions. Metoprolol succinate extended-release tablets are selective beta1-blockers used for the treatment of hypertension, angina pectoris, and symptomatic stable chronic heart failure with abnormal left ventricular systolic function. Common adverse effects of the drug include fatigue, dizziness, headache, chills in the extremities, bradycardia, shortness of breath on exercise, palpitations, abdominal pain, nausea, vomiting, diarrhea, and constipation. Contraindications to the drug are: contraindication in patients with cardiogenic shock, patients with sick sinus node syndrome, patients with atrioventricular block of the II and III degrees, patients with unstable, decompensated heart failure, people with symptomatic bradycardia or hypotension, patients with severe peripheral vascular disease with the risk of gangrene, allergy to any of the components in the drug or other beta-blockers. When using Metoprolol succinate extended-release tablets, it should also be noted that it should not be used by pregnant women in the last trimester of pregnancy, as well as before and after delivery, and should be used with caution by athletes. The drug should not be stopped suddenly, otherwise rebound phenomenon will occur. If you need to stop taking the drug, you should gradually reduce the dosage under the guidance of a professional doctor until the drug is finally stopped. Metoprolol succinate extended-release tablets should be used under the guidance of a professional doctor, do not blindly self-medication, in order to avoid aggravating the condition or serious adverse consequences.