Cenforce FM 100 interferes with the creation of a hormone called PDE5. Relaxes the veins surrounding the penis to allow more blood flow during sexual pleasure. By using Cenforce FM, men can easily get and maintain a firm erection after being sexually aroused. You will get an erection after being sexually aroused and the erection will go away on its own. Whether or not you have been having erectile dysfunction problems for a while, Cenforce FM will start working immediately.