Taking metoprolol for premature ventricular contractions is not a cure, but only serves to control the heart rate and reduce the number of premature beats that occur. Premature ventricular contractions are a common type of arrhythmia, due to abnormal electrical activation in the ventricles leading to premature heartbeats, which can cause panic and chest tightness when there are more premature ventricular contractions. Metoprolol tablets inhibit sympathetic excitation by blocking beta 2 receptors, which can control the number of premature ventricular beats, thus relieving the symptoms of panic, but it does not cure premature ventricular beats fundamentally, and is not suitable for people with premature ventricular beats who have an overall slower heart rate. The adverse reactions of metoprolol tablets are weakness, gastrointestinal dysfunction and drowsiness in a few patients at the initial stage after taking the drug, which may disappear on their own after continuing to take the drug. Occasionally there are non-specific skin reactions and limb cold phenomenon. Contraindications are patients with severe atrioventricular block, cardiac insufficiency, cardiogenic shock, significant bradycardia, severe bronchial asthma, sick sinus node syndrome. The treatment of premature ventricular contractions should first clarify the cause of the disease, in addition to coronary artery disease, cardiomyopathy, hyperthyroidism, electrolyte disorders, depression, insomnia, nervousness, fatigue, etc. can also cause premature ventricular contractions, and then the treatment should be to identify the cause of the disease, and then active treatment of the primary disease can be effective in controlling premature ventricular contractions. Therefore, when diagnosed with premature ventricular contractions, you should actively seek medical treatment, and under the guidance of specialists to carry out relevant tests to clarify the cause of the disease and then give standardized treatment.