Do You Want Your Sex Life to Be Successful? So visit our store and from there you can get cenforce online. The main function of this drug is to relax the muscles of the penis. And to maintain erection. The drug contains sildenafil. Which is assumed to be about 85%. It is important to consult a doctor once before taking this medicine so that you do not experience any side effects. This medication is generally safe with little or no side effects.