Metoprolol may be taken for short periods of time for paroxysmal tachycardia, and patients with coronary artery disease and high blood pressure may need to take oral metoprolol for long periods of time. Metoprolol can slow down the heart rate and lower blood pressure. For patients with paroxysmal tachycardia, if the primary cause can be removed, oral metoprolol can be taken for a short period of time, and the drug can be gradually stopped when the condition improves. Hypertension and coronary heart disease are lifelong diseases. Taking metoprolol not only lowers blood pressure, but also has the effect of slowing down the heart rate and decreasing myocardial oxygen consumption, so long-term oral metoprolol is needed. Adverse effects such as fatigue and headache may occur with the use of this drug, and it is contraindicated in patients with cardiogenic shock and sick sinus node syndrome. When using Metoprolol in clinical practice, it is important to use the drug under the guidance of a physician, choose the appropriate indications and dosage, and report to the doctor in time to adjust the treatment program if there are any uncomfortable symptoms in the process of taking the drug.