Fildena 50 is can be useful for erectile dysfunction or impotence in men. The main contains is sildenafil citrate included in this pill. The sildenafil citrate in this drug can work by improving the blood flow to the penile organ. This pill helps to improve sexual activity. When the penis will be full of blood flow, you can easily strengthen the erection. The penis will be erect while having sex time. When the penis will be erect and hard, you can easily have 4 to 5 hours of sex.