In today's times, sexual pleasure has become very necessary for men, but some men cannot feel erections during intercourse. These sexual problems are called impotence and erectile dysfunction. Fildena 100mg contains an ingredient called sildenafil which helps in increasing the blood flow to the tissues of the penis in men. The effect of this medicine lasts for 4 to 6 hours. You can take this medicine 30 minutes or 1 hour before intercourse. You can take this medicine as per the doctor's advice.