When you take Fildena 50 mg, the medicine starts acting on the blocked blood flow in the body. It acts as a PDE-5 inhibitor in the body. Men will not be able to get an erection if there is no adequate blood flow to the penile area. This happens if the PDE-5 enzyme stops the blood flow. Once the effect of the PDE-5 enzyme is reduced, blood will start flowing to the penile area. As the pressure increases, men will be able to get an erection. Fildena 50 mg medicine will not cause any side effects and can be taken whenever you are interested in sexual life.