Antiplatelet drugs, nitrates, diuretics, etc. should be taken correctly after cardiac bypass surgery as prescribed by the doctor. 1. Antiplatelet drugs: Aspirin should be used after coronary artery bypass graft surgery, or clopidogrel should be added to prevent re-obstruction of blood vessels. 2. Nitrate drugs: in order to prevent coronary artery spasm, you can also follow the medical advice to take isosorbide mononitrate, nitroglycerin, in order to dilate the coronary arteries. 3. Diuretics: If postoperative patients with cardiac insufficiency, spironolactone, furosemide and other diuretics can be used as appropriate. In addition to the above drugs, corresponding drug treatment should be carried out for the primary disease. Hypertensive patients should follow the medical advice to take antihypertensive drugs, such as nifedipine, hydrochlorothiazide, etc.; should also follow the medical advice to take lipid-lowering drugs such as Rosuvastatin. The specific situation is also after the medical treatment, follow the doctor’s prescription medication.