Whether sildenafil can be used two years after the heart coronary bypass should go to the medical institution to consult the professional physician’s opinion, in general, the use of sildenafil is not recommended, may lead to adverse reactions, and even serious consequences. After cardiac bypass, many medications will be used to ensure the normal function of the heart, to ensure that the patient’s daily life will not be affected, generally use anticoagulant drugs such as aspirin, use of lipid-lowering drugs, such as Rosuvastatin, combined with high blood pressure people need to use antihypertensive drugs such as metoprolol will also be used to expand the blood vessels of the drug, such as nitroglycerin and so on. Nitrates such as nitroglycerin will react with sildenafil, which will increase its antihypertensive and vasodilator ability, resulting in hypotension, which may have serious consequences. At the same time with its own cardiovascular disease of people using sildenafil, the chances of adverse reactions will be greatly increased, such as abdominal pain, color, flushing, dizziness, headache, hypotension and so on. The use of Sildenafil is strictly prohibited in people who are allergic to Sildenafil, or who are using nitrates and guanylate cyclase stimulators. Cardiac bypass patients who need to use sildenafil must seek professional advice from a physician and follow the doctor’s instructions.