The chemical name of Byxin Tong is Nifedipine Controlled Release Tablets, the main functions are: i. Treatment of hypertension. II. For patients with coronary artery disease, especially chronic stable angina pectoris. Its usage is generally once a day, one 30mg oral dose, which cannot be broken. Possible adverse reactions during clinical use include peripheral edema, headache, panic, transient angina attack, tachycardia, constipation, nausea, hypotension, especially postural hypotension, syncope, insomnia, allergy, etc. However, in general, the above mentioned adverse reactions are mostly tolerable. In addition, it is contraindicated in patients with hypersensitivity to nifedipine, in patients with cardiogenic shock, and in women who are pregnant or breastfeeding. Overall, it is a well-tolerated drug with significant antihypertensive effect and is suitable for most people with hypertension, but it is still recommended to be used under the guidance of a physician.