Boydine is the trade name, its generic name is felodipine extended-release tablets, have done cardiac bypass surgery is not recommended to take felodipine extended-release tablets to lower blood pressure. Felodipine extended-release tablets have the effect of lowering blood pressure, but aortic stenosis, acute myocardial infarction after heart failure with caution, unstable angina, decompensated heart failure, acute myocardial infarction disease is prohibited. Cardiac bypass grafting is used for the treatment of diseases related to coronary artery stenosis or obstruction, try not to take felodipine extended-release tablets after surgery. Adverse reactions such as ankle edema, palpitations, headache, dizziness, and fatigue may also occur when taking felodipine extended-release tablets, and felodipine extended-release tablets are contraindicated during pregnancy and lactation. If you have high blood pressure after heart bypass surgery, you should be instructed by a doctor before taking felodipine extended-release tablets, and you should not use the medication on your own.