Taking a quarter of Betalax can lower blood pressure, Betalax starting ingredient is metoprolol, the specific effect varies from person to person. Metoprolol belongs to a kind of beta-blocker, can slow down the heart rate, reduce myocardial contractility, antagonize sympathetic excitation, so that the cardiac output of the heart decreases, the blood pressure decreases. Some patients are more sensitive to metoprolol and can achieve the effect by taking one-fourth of the tablet, producing a slowed heart rate drop, low blood pressure, and improved cardiac function, while those who are not sensitive may need to take one-half or one tablet to achieve the desired effect. Indications for metoprolol include hypertension, angina, and chronic heart failure. It is contraindicated in people who are allergic to its ingredients, cardiogenic shock, symptomatic bradycardia or hypotension, bronchial asthma, and Raynaud’s syndrome. Common adverse reactions include dizziness, headache, chills in the extremities, bradycardia, abdominal pain, nausea, vomiting diarrhea, and constipation. Taking Metoprolol should be applied under the supervision of a doctor.