Fildena 100 is used to treat sexual problems in men. Sildenafil contains a key ingredient called Citrate. This medicine works to increase blood flow and relax the muscles. It is imperative to take this medicine one hour before planning intercourse so that you can enjoy intercourse for a long time with your partner. This medicine should be taken only once a day. It is imperative to take an hour before taking this medicine. The effect of this drug lasts for 4-5 hours, which is enough for an erection.