Metoprolol succinate extended-release tablets is a kind of high blood pressure, heart rate control drugs, belongs to the beta-blocker, the side effects of this drug can be manifested in the blood system, central system, etc., if there is any discomfort, you should seek medical attention. 1. Hematologic system may include thrombocytopenia, bleeding, and so on. 2. Central system may include dizziness, headache, weakness, abnormal sensation and taste, muscle spasm and pain. 3. Cardiovascular system may include palpitation, bradycardia, arrhythmia and myocardial infarction. 4. Respiratory system may include shortness of breath, bronchospasm, and bronchial asthma. 5. Skin manifestations may be alopecia, skin allergy, photosensitivity reaction, etc. For patients with cardiogenic shock, acute heart failure, hypotension, etc. should be prohibited to use the drug. Metoprolol succinate extended-release tablets should be standardized under the guidance of a doctor, and during the use of the drug to monitor the heart rate, blood pressure changes, the emergence of discomfort in a timely manner to consult a doctor and follow the doctor’s instructions for treatment.