Viagra (sildenafil) is indicated for the treatment of erectile dysfunction in adult males under medical supervision. It is contraindicated in men for whom sexual intercourse is inadvisable due to cardiovascular risk factors such as patients with cardiac failure, unstable angina pectoris and patients with past history of heart attack. You have written details of your heart problem. Advice 1. My personal advice is to avoid Viagra if you have angina pectoris, very high or uncontrolled blood pressure or any past history of heart attack. If you do have these problem then you can use Viagra under your cardiologist supervision 2. Avoid smoking and alcohol 3. Start workout in gym 4. Lose weight if you are overweight 5. Investigations – blood sugar (F & PP), lipid profile, measurement of blood pressure I hope this information will help you. I will be happy if you ask another question Thanks