Betalucil generic name is Metoprolol Tartrate Tablets, after taking Metoprolol Tartrate Tablets slow heart rate usually after 5-7 hours after stopping the drug, can return to normal, but due to the existence of individual variability, can not be generalized. Metoprolol tartrate tablets are a kind of beta-blocker, which can be used to treat hypertension, angina and other diseases. Some patients may experience adverse reactions such as slowing of heart rate, lowering of blood pressure and excessive dreaming while taking Metoprolol Tartrate Tablets. The half-life of metoprolol tartrate tablets is 3~7 hours, and the adverse effects of slowed heart rate can mostly return to normal in 5~7 hours after most patients stop taking the drug in accordance with medical advice. There are certain contraindications to the drug, for bradycardia, cardiogenic shock, severe or acute heart failure and other patients, need to be contraindicated to take this drug. It is recommended that during the administration of metoprolol tartrate tablets, patients who experience slow heart rate should go to a regular hospital for relevant examinations to identify the cause of the disease.