Betaxolol is metoprolol, which has the effect of slowing down the heart rate and improving heart function, and is used for the treatment of coronary heart disease, high blood pressure and heart failure. Metoprolol is a beta-blocker, the effect on the heart is to slow down the heart rate, inhibit myocardial contraction, reduce cardiac output, thereby reducing myocardial oxygen consumption, improve cardiac function, mainly used in the treatment of hypertension, angina pectoris, myocardial infarction, arrhythmia, hypertrophic cardiomyopathy, cardiac neurosis, chronic heart failure and other diseases. The use of Metoprolol must be used properly under the guidance of a doctor to avoid adverse reactions such as bradycardia, fatigue, headache, dizziness, nausea, vomiting and so on. It is contraindicated for people who are allergic to this drug, sick sinus node syndrome, II, III degree atrioventricular block, cardiogenic shock, severe bradycardia, severe heart failure.