Generic name of Viagra is Sildenafil, and patients with coronary heart disease can take small doses of Sildenafil. Sildenafil is mainly used for the treatment of erectile dysfunction sexual diseases in men; the drug may affect the cardiovascular system during medication, causing cardiac arrest, hypotension, heart failure and other discomforts. For patients with coronary heart disease combined with low blood pressure, heart failure, unstable angina, you can take a small dose of sildenafil, and there are no contraindications for both. Usually, sildenafil may cause angina pectoris, tachycardia, hypotension, myocardial ischemia and other adverse reactions; allergic to the components of the drug, taking nitrate drugs is prohibited; the need to monitor blood pressure during the use of the drug, and any discomfort should be discontinued immediately after the appearance of the drug to the clinic. The above medication should be used under the guidance of a doctor, avoid self-medication, so as not to cause adverse effects.