Viagra is generically known as Sildenafil Citrate. Sildenafil citrate is not recommended for patients with coronary artery disease, it is a drug used to treat male sexual dysfunction. Sildenafil citrate can cause over-excitement and accelerate myocardial oxygen consumption, which is detrimental to coronary artery disease. Sildenafil citrate has the potential to make the narrowing of the coronary artery lumen more severe, leading to angina attacks and even myocardial infarction, which can be life-threatening in severe cases. Coronary artery disease is caused by narrowing of the lumen of the coronary arteries, and it can lead to symptoms such as tightness and cramping sensation behind the sternum and back. After taking too much sildenafil citrate, side effects such as blurred vision, seeing clearly, vertigo, and dizziness may occur. Patients with coronary artery disease need to follow the doctor’s advice in their normal life, exercise and treatment, and avoid making unauthorized decisions that may cause irreparable consequences.