Betalucil, also called metoprolol belongs to the category of first-line, long-acting antihypertensive drugs, which are prescription medications. In addition to lowering a patient’s blood pressure, they can slow the heart rate, inhibit sympathetic excitability, and are ideal for accelerated heart rates due to cardiac neurosis or dysfunctional regulation of the vegetative nervous system. It can also slow down the progression of heart failure and angina, prevent left ventricular remodeling, and is a secondary prevention drug for patients with heart failure and angina. This type of drug is very widely used in the clinic because of its versatility. During the application of this drug, it is important to monitor the heart rate and blood pressure. Some people may experience a slowing of the heart rate and a decrease in blood pressure while taking this drug. Adverse effects of this drug are very rare, and it is forbidden to take this drug for patients with the presence of chronic obstructive pulmonary disease or bronchial asthma.