Impotence occurs when you cannot achieve erection, maintain erection or ejaculate on a continuous basis. Fildena 100 mg increases the blood supply to the male organ. However, it works by relaxing the muscles inside your member. Depression can affect your ability to get up. This medicine should be taken only once a day. The main ingredient in this drug is sildenafil citrate which helps relax muscles by improving blood flow to the penis.