Cenforce D inhibits phosphodiesterase type 5 (PDE-5). The chemical messenger known as cyclic GMP, which normally stimulates the blood vessels in the penis to enlarge by relaxing the muscles in the blood vessel walls, is normally broken down by PDE-5.As a result, the penis receives more blood, which causes a firm erection. Blood arteries remain dilated for a longer duration when PDE-5 is blocked, which enhances blood flow to the penis and aids in maintaining an erection.Serotonin, a neurotransmitter that promotes communication between nerve cells, particularly those responsible for ejaculation, is activated more when dapoxetine is taken. Serotonin's enhanced action prolongs ejaculation and improves control over the process. Dapoxetine was first developed as an antidepressant.