Fildena Super Active tablet contains Sildenafil Citrate, which is a PDE5 enzyme inhibitor. The mechanism of the PDE5 inhibitor is slightly complex. Fildena Super Active stops the activity of the PDE5 enzyme and halts the degradation of cyclic Guanosine Monophosphate (cGMP). The body then produces nitric oxide, which boosts the blood flow. cGMP and nitric oxide together work to dilate arteries, relax the muscles, and boosts blood flow to the penile organ, enhanced blood flow results in an erection.