The correct way to take nifedipine extended-release tablets type 2 is mainly from the dosage of the drug, the precautions for taking, and the contraindications of the combination. 1. Dosage: For chronic stable angina, vasospastic angina, and essential hypertension, one tablet of 20 mg should be taken twice a day, one tablet each time. 2. Precautions for taking: this medicine should be taken with water after meals, if taken with food, it can delay but not reduce the absorption of the drug; the interval between two doses should be not less than 4 hours. Nifedipine allergy, cardiogenic shock patients, pregnant women are prohibited. Discontinue breastfeeding when the drug is used by nursing mothers; there is no reference data on the use of the drug in children and the elderly. After taking the drug may have headache, red face, upper and lower extremities red and swollen and other adverse reactions, usually after stopping the drug can be relieved. 3. Contraindications: Nifedipine can cause the increase of digoxin and theophylline blood concentration, so the relevant blood concentration should be closely detected. Rifampicin can accelerate the degradation of nifedipine, so nifedipine can not be combined with rifampicin. This product should not be taken at the same time with grapefruit juice, because grapefruit juice can slow down the rate of metabolism of this product in the body, thus enhancing the effect of this product. The dosage of the above drugs is for reference only, the specific dosage and usage should follow the doctor’s instructions, and should not be used on its own to avoid adverse reactions.