Boydine is the trade name and its generic name is Felodipine Extended-Release Tablets; this medication only needs to be taken once a day, not twice. Felodipine Extended-Release Tablets is a Western drug that is a calcium channel blocker; it is used to treat high blood pressure and stable angina. The drug is an extended-release preparation, which is a long-acting antihypertensive drug that needs to be taken only once a day, not twice. Adverse effects of the drug include dizziness, headache, facial flushing with heat sensation, ankle edema, fatigue, sensory abnormalities, palpitations, tachycardia, nausea, vomiting, abdominal pain, rash, pruritus, urticaria, arthralgia, and myalgia. Contraindications to the use of this drug are: patients who are allergic to felodipine or any of the components in this product are prohibited; patients with acute myocardial infarction are prohibited; patients with unstable angina are prohibited; patients with non-compensated heart failure are prohibited; patients with galactose intolerance, lactase deficiency, glucose-galactose malabsorption are prohibited; pregnant women and lactating women are prohibited. Felodipine extended-release tablets should be used under the guidance of a professional doctor, do not blindly self-medication, in order to avoid adverse reactions.