Cenforce is a popular and best drug to solve the problem of impotence. Sildenafil acts as the active ingredient in the Cenforce drug. Avoid taking these tablets if you are suffering from heart disease or other serious illness. Cenforce is taken one hour before sex, after which the effect lasts for 5-6 hours. Cenforce should be kept away from small children and pets. Cenforce is the best drug used by men.