The generic name of Betalucil is Metoprolol Tartrate, and a fast heartbeat will result in low blood pressure and slow heartbeat after taking Metoprolol Tartrate. Clinically, metoprolol tartrate belongs to the category of beta receptor antagonists, which inhibit myocardial contractility and slow down the heart rate, and is mainly used in the treatment of hypertension, angina pectoris, arrhythmia and other diseases. Therefore, the drug is able to reduce blood pressure as well as slow down the heart rate after taking it. Usually the drug may cause dizziness, fatigue, bradycardia, diarrhea, constipation, abnormal sensation, edema and other discomforts after taking it. It is contraindicated in patients with symptomatic bradycardia and hypotension. Patients with coronary heart disease should not stop taking the drug suddenly to avoid deterioration of the condition. Pregnant women and lactating women need to use the drug under the guidance of a doctor. If you need to take Metoprolol Tartrate for fast heartbeat, it is recommended to consult a doctor in time to decide the dosage and learn the precautions after a comprehensive assessment of the condition.