PDE5, a hormone, has been shown to interfere with Cenforce FM (Sildenafil Citrate Tablets). It relaxes blood vessels around the penis to allow for increased blood flow during sexual stimulation. After being sexually aroused using Cenforce FM men can quickly get and maintain a hard erection. You can get an erection by simply being sexually stimulated. The erection will then go away automatically. Even if you've been having erectile dysfunction problems for a while, Cenforce FM will immediately start working.