Fildena 100 is used to treat erectile dysfunction in men. This medicine contains a key ingredient called Sildenafil Citrate which helps in relaxing the blood vessels and increasing the blood flow. This medicine should be taken only once a day. It is necessary to consult a doctor once before taking this medicine. The effect of this medicine lasts for 3 to 4 hours. This medicine is taken for men above 18 years of age.