The generic name of Betalucil is Metoprolol, and patients with fast heart rates should choose the right dosage according to their physician’s instructions, rather than taking one tablet. Metoprolol is a beta-blocker, which is able to slow down the heart rate, and patients with fast heart rate can control their heart rate by taking Metoprolol orally. Metoprolol has a variety of dosages and specifications in the clinic, for example, there are ordinary tablets and extended-release tablets, and the dosage of taking the drug has obvious differences, so it is necessary to choose the appropriate dosage according to the condition, rather than taking the drug on their own or reading the instructions. Metoprolol belongs to the western prescription drugs, clinically can be used for hypertension, coronary heart disease and the treatment of tachyarrhythmia, the adverse effects of the drug are headache and dizziness, cold limbs, nausea, bradycardia, hypotension, etc. Allergy to the components of the drug, bronchial asthma, severe bradycardia, second-degree and third-degree atrioventricular block, cardiogenic shock and so on, is prohibited for patients. Patients with fast heart rate should go to the hospital and choose the appropriate dose under the guidance of a physician, and if the dose of the drug needs to be adjusted, it should also be under the guidance of a physician, so as not to induce serious heart disease.