Cenforce D interferes with the production of a hormone called PDE5. It relaxes the blood vessels surrounding the penis to allow increased blood flow during sexual arousal. When using Cenforce D, men can easily get and maintain a hard erection after being sexually stimulated. You will only get an erection after becoming sexually aroused and the erection will go away on its own. Even if you have been having erectile dysfunction problems for a long time, Cenforce D will start working right away. Erectile dysfunction is a name of condition when cGMP enzyme is replaced by another enzyme PDE5 (phosphodiesterase type-5). PDE5 enzyme breaks down cGMP and takes its place. Blood flow is restricted by PDE5 enzyme leading to causing erection problem in men. Blood is essential for erection achievement. Cenforce D inhibits PDE5 enzyme, enhancing blood flow to the penile area. Blood filled penile region makes it easier for men to achieve erection. Cenforce D also releases cGMP in the body as without it erection is impossible.