Cenforce Professional works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). PDE5 breaks down cyclic GMP (cGMP), which is a compound responsible for relaxing the smooth muscles of the penis and promoting blood flow. By blocking PDE5, Cenforce Professional allows cGMP to accumulate, leading to increased blood flow to the penis and helping achieve and sustain an erection in response to sexual stimulation.