Sildenafil acts as the active ingredient in the Cenforce drug. The Cenforce drug is taken 1 hour before intercourse, after which the effect lasts for 4-5 hours. The Cenforce drug is also found in different strengths. Sinophores drug is the best drug for impotence. You can enjoy sex better after taking Cenfoce drug. It is very important to consult a doctor if you are suffering from any other serious illness before taking Cenforce.