Taking one nifedipine extended-release tablet for 24 hours is not recommended. The usual dose is one to two tablets taken twice in 24 hours. The main ingredient of nifedipine extended-release tablets is nifedipine, which is used to treat all types of high blood pressure and angina pectoris. The minimum effective blood concentration (10 ng/ml) is maintained for about 12 hours per dose. If it takes longer than 12 hours, it may cause insufficient effective blood levels, which may lead to problems such as increased blood pressure. It is usually taken orally as 1 to 2 tablets twice a day or as directed by a doctor. The maximum dosage is 4 tablets at a time, 12 tablets a day. If you take nifedipine extended-release tablets only once in 24 hours, you don’t need to worry too much, you can observe your health condition, monitor your blood pressure, and seek medical advice immediately in case of any discomfort. Common adverse reactions to nifedipine extended-release tablets include headache, decreased blood pressure, swelling, etc. Occasionally, urticaria and hyperglycemia are seen. If the adverse reactions are serious, immediate medical attention should be sought for relief. In addition, allergic to the product, pregnant women, children and other people are prohibited. The specific dosage of nifedipine extended-release tablets needs to be judged by the doctor in conjunction with the condition, so it is necessary to take the drug according to the doctor’s instructions, and it is not advisable to change it on your own.