CENFORCE is an oral therapy for dealing with impotence in males. It is used for treating erectile dysfunction (ED) in males. It contains sildenafil citrate which inhibits Phosphodiesterase 5 (PDE 5) resulting in manifestation of action of cGMP which causes erection during sexual stimulation. It does not act as aphrodisiac; It requires an external stimuli to act. Sildenafil is the first medicine launched by Pfizer as a treatment of erectile dysfunction. It does not cure the main cause of ED.