The generic name of Betalucil is Metoprolol, which can cure atrial fibrillation, and the drug can regulate arrhythmia by slowing down the heart rate, which is more effective. Metoprolol is a beta-blocker, which can slow down atrial conduction by inhibiting myocardial contraction, and at the same time play a role in slowing down the heart rate and lowering blood pressure. In the clinic, it is mainly used for supraventricular tachyarrhythmia, but also for the prevention of myocardial ischemia, tachyarrhythmia and chest pain. It should be noted that Metoprolol tartrate medication may cause adverse reactions such as dry mouth, conjunctivitis, and painful muscle spasms; in addition, the drug should not be used in patients with cardiogenic shock, heart failure, and atrioventricular block, and should not be used in patients who are allergic to Metoprolol. Metoprolol needs to be used under the guidance of a professional doctor.