Fildena 25 is a very successful drug for treating erectile dysfunction (ED) in men. If you have ED, you may have trouble achieving or keeping an erection, which can cause stress, anxiety, and relationship problems. This medicine contains an ingredient called Sildenafil which helps in relaxing the tissues of the penis in men. This medicine is taken only by men. The effect of this medicine lasts for 4 to 6 hours. Take this medicine as advised by the doctor.