Viagra, scientifically known as sildenafil citrate, is effective for heart disease caused by pulmonary hypertension. Sildenafil citrate is a kind of drug for treating erectile dysfunction and pulmonary arterial hypertension, which does not have therapeutic effect on all heart diseases, the main effect lies in the inhibition of smooth muscle, so as to diastole blood vessels to improve the pulmonary arterial hypertension, so the heart disease caused by pulmonary arterial hypertension has therapeutic effect, but other causes of heart disease caused by changes in the structure of the heart, dyslipidemia, hypertrophic cardiomyopathy, and so on, does not have any therapeutic effect. heart disease, there is no therapeutic effect. Meanwhile, sildenafil is risky for some people with cardiovascular diseases, such as left ventricular outflow tract obstruction, severely impaired autonomic control of blood pressure, and myocardial infarction, stroke, etc. Therefore, when using sildenafil for cardiac disease, it is necessary for the doctor to judge and adjust the dosage of the drug according to the situation before using it. The use of sildenafil may also appear vasodilatation, low blood pressure, cystitis, headache and other adverse reactions, and in severe cases even to the loss of hearing, blindness. At the same time, recent and ongoing use of nitrate drugs and guanylate cyclase stimulators, and the use of sildenafil is strictly prohibited for people who are allergic to sildenafil. The drug should be used in accordance with medical advice.