Nifedipine extended-release tablets are usually taken for about a week to stabilize blood pressure. Nifedipine extended-release tablets are commonly used antihypertensive drugs in clinical practice, belonging to a kind of calcium channel blocker. Generally, it takes effect in 15~30 minutes after taking the medicine, and can be maintained for 8~12 hours, and it can stabilize blood pressure in about a week after taking the medicine in general. Adverse reactions: taking nifedipine extended-release tablets can be swollen ankles, calves, chest pain, nausea and other discomforts. Precautions: It should be swallowed, not chewed. Use with caution in patients with hypotension, severe aortic stenosis, hepatic and renal insufficiency. Contraindications: allergic to nifedipine ingredients, children and pregnant women are prohibited. If you need to use nifedipine extended-release tablets need to standardize the use of medication under the guidance of a doctor, if the use of blood pressure fluctuations during the period of large or discomfort, you should immediately consult a doctor.