fildena 100 is a prescription drug used for erectile dysfunction, impotence, and premature ejaculation in men. It is a heavy dose and works by increasing blood flow to the penis. This helps men get or maintain an erection. This medicine contains an ingredient called sildenafil which helps men to have an erection for a longer period. The effect of this medicine lasts for 4 to 6 hours. Take this medicine as per your doctor's advice. Do not consume fatty foods or alcoholic beverages with this medicine.