The ingredient of Betalucil is metoprolol, and the heart rate of 100 beats per minute can be treated with metoprolol if there are symptoms of palpitation and chest tightness. Metoprolol’s role is to inhibit the heart’s beta receptors, can play a role in slowing down the heart rate, clinical treatment of tachyarrhythmia, for sinus tachycardia, rapid atrial fibrillation patients have therapeutic effect. Heart rate of 100 beats per minute should pay attention to find the cause, some patients with rapid heart rate without symptoms, may be related to exercise, nervousness, the need for oral metoprolol treatment, the symptoms can be relieved on their own. Metoprolol is a western prescription drug, the adverse effects of the drug are dizziness, nausea, hypotension, bradycardia, cold limbs, etc. It is contraindicated in patients who are allergic to the drug components, cardiogenic shock, second and third degree atrioventricular block, severe bradycardia, bronchial asthma. Patients with fast heart rate should pay attention to find the cause, if the symptoms are obvious, go to the hospital and actively diagnose and treat. The above drugs need to be used under the guidance of a physician.