Viagra is the trade name and the generic name is sildenafil citrate. Sildenafil citrate should not be taken by patients with coronary artery disease. Taking this drug will make people over-excited, increase myocardial oxygen consumption, resulting in myocardial ischemia, arrhythmia and other adverse reactions, and may exacerbate the degree of narrowing of the coronary artery lumen, inducing myocardial infarction, serious cases of life-threatening, Sildenafil Citrate will aggravate the burden on the patient’s heart, which is not conducive to the control of the condition. The interaction of such drugs with isosorbide mononitrate, a drug used in the treatment of coronary heart disease, can lead to significant vasodilatation of blood vessels triggering a sudden drop in blood pressure. Patients suffering from cardiovascular and cerebrovascular diseases should avoid the combination of the two. It is recommended that patients avoid excitement and anger, maintain emotional stability, regular physical examination, if there are symptoms of discomfort need to consult a doctor in a timely manner. Drugs should be applied under the guidance of a doctor.