Nifedipine extended-release tablets are an antihypertensive drug that is a calcium antagonist. Nifedipine extended-release tablets are formulated to release nifedipine slowly to achieve long-lasting blood pressure control. There are two types of nifedipine extended-release tablets in the clinic, one is called nifedipine extended-release tablets I; the other is called nifedipine extended-release tablets II. Because nifedipine extended-release tablets make the dosage form into a slow-release state, it is not possible to break and use, so if the patient’s blood pressure is too low after using nifedipine extended-release tablets II, it can be changed to nifedipine extended-release tablets I, but it is not possible to split the nifedipine extended-release tablets II into half to use. Nifedipine extended-release tablets can be used to lower blood pressure, relieve angina pectoris and variant angina symptoms. Common adverse effects of nifedipine extended-release tablets include hypotension, palpitations, peripheral edema, myocardial infarction, ventricular arrhythmia, facial flushing, nausea, abdominal distension, diarrhea, gingival hyperplasia, dizziness, headache, coughing, dyspnea, swelling of the ankles, feet, and calves, anxiety, and nervousness. It is prohibited to use during the patient’s pregnancy and lactation, and it is prohibited to use for those who are allergic to nifedipine. Nifedipine extended-release tablets are not recommended for self-use and need to be used under medical supervision.