Betalucil generic name is metoprolol tartrate, after taking the drug heart rate more than 50 times per minute is not normal, is an adverse drug reaction. Metoprolol tartrate belongs to the group of beta-blockers and is mainly used in the treatment of supraventricular tachyarrhythmias, with acute myocardial infarction, myocardial ischemia and other diseases. The use of this drug may affect the body’s circulatory system, resulting in discomfort such as cold extremities, bradycardia, arrhythmia, and temporary worsening of heart failure. Therefore, after taking the drug, the heart rate drops to more than 50 times per minute is not normal. It is possible that the bradycardia is due to an adverse reaction to the drug, which requires prompt medical attention and standardized treatment under the guidance of a doctor. Usually the drug may also affect the central nervous system, respiratory system, digestive system and so on in the process of using the drug, so that sleep disorders, nausea, vomiting, shortness of breath and other discomforts occur. It should be prohibited for people with uncompensated cardiac insufficiency and cardiogenic shock, and liver and kidney functions as well as heart rate need to be monitored in the process of using the drug. The above medication should be used under the guidance of a doctor, avoid self-medication, in order to avoid adverse consequences.