Sildenafil Citrate is the active ingredient in Cenforce 120 mg and acts as a phosphodiesterase type-5 (PDE-5) inhibitor. This inhibits the PDE-5 enzyme and protects cyclic guanosine monophosphate (cGMP) from being destroyed, which is the main ingredient that causes erectile dysfunction. When this is done, the cGMP concentration in the penile muscle increases and promotes sexual arousal, which leads to more effective erections.
The effects of the cGMP-specific phosphodiesterase type 5 inhibitor start working within 30 minutes after intake and continue for about four hours. It is best to take this medication before a sexual intercourse so that the cGMP levels in the penis can reach their maximum level and stimulate a hard erection.