Nifedipine extended-release tablets (I) are usually taken orally twice a day. 1.Nifedipine Extended-Release Tablets (I) are 10mg in size and are indicated for all types of hypertension and angina pectoris. The time curve of blood concentration of this extended-release tablet is gentle and long-lasting, and the time above the minimum effective blood concentration can be maintained for up to 12 hours for each dose, so according to the instructions for use of the drug, the usage is 1~2 tablets twice a day. 2. Nifedipine extended-release tablets (I) common adverse reactions are headache, red face, lower extremity edema, nausea, abdominal distension. 3.Contraindications are allergic to nifedipine and this product; ever cardiogenic shock; severe aortic stenosis; unstable angina; recent myocardial infarction; patients taking rifampicin; pregnant women. Note that patients with severe hypotension and decompensated heart failure need to use the drug as prescribed. The use of specific drugs need to consult a professional physician or pharmacist, do not take without authorization to avoid adverse consequences.