The generic name of Betalucel is Metoprolol, and a heartbeat of 90 beats per minute does not determine whether to take half a tablet or one tablet, it depends on the specific dose and take Metoprolol orally in small doses. Metoprolol has the effect of inhibiting beta receptors, in lowering blood pressure at the same time can slow down the heart rate, the heart rate of patients can be fast oral metoprolol treatment, but to start from a small dose of oral. Metoprolol has different specifications in the clinic, so you can’t judge the dosage of the drug based on the number of tablets, the exact amount of therapeutic drug should be based on the dose. Adverse reactions to metoprolol include dizziness, nausea, cold extremities, dyspnea, bradycardia, allergy to the components of the drug, bronchial asthma, cardiogenic shock. It is contraindicated in patients with second- and third-degree atrioventricular block, severe bradycardia. When taking oral metoprolol in patients with a fast heart rate, it is important to use the drug under the supervision of a physician and not to decide the amount of the drug to be taken on the basis of the number of tablets.