Sympathetic excitation heart rate fast take betalactam can usually take effect in 1 to 2 hours, the use of drugs need to be strictly under the guidance of a doctor. Betalucil, also known as metoprolol, is a beta-blocker commonly used in clinical practice, which can effectively inhibit sympathetic excitation, slow the heart rate, and reduce the oxygen consumption of cardiomyocytes. With the use of this drug, the effects of the drug can usually be realized within 1 to 2 hours. As the drug in the use of the process will appear nausea, lower blood pressure, constipation, headache and other adverse reactions, you need to follow the doctor’s instructions to regulate the use of unauthorized use of medication, the emergence of adverse reactions need to consult a doctor in a timely manner, the use of the drug is prohibited for those who are allergic to the drug.