Nifedipine extended-release tablets are usually taken orally twice a day and need to be used according to medical advice. Nifedipine extended-release tablets can simultaneously diastole normal blood supply area and ischemic area of the coronary arteries, antagonize coronary artery spasm, increase the supply of oxygen, and can inhibit myocardial contraction, reduce myocardial metabolism, reduce oxygen consumption. It can also diastole peripheral resistance vessels, so that the systolic and diastolic blood pressure is reduced, reducing cardiac afterload. Because of the short half-life, the general instructions recommend twice daily. Adverse reactions such as jaundice, chest pain, headache, flushing, drop in blood pressure, itching, abdominal pain, nausea, constipation, and hyperglycemia may occur after use of this product. Severe aortic stenosis, patients with hepatic and renal insufficiency, lactating women should be used with caution, to stop the drug under the guidance of a doctor, low blood pressure, pregnant women are prohibited. Patients who want to use nifedipine extended-release tablets are recommended to go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examinations, and avoid blind use of drugs.