<p>Fildena 150 mg tablet acts through blocking of the enzyme PDE5 which regulates blood flow via the penis. Through blocking PDE5 this results in the cyclic Guanosine monophosphate (cGMP) which causes an increase in the level of relaxation for the smooth muscles in that region of the penile. This allows blood flow to be relaxed that helps to keep and keep an erection in place after sexual stimulation.</p><p> </p>