Fildena treats erectile dysfunction by relaxing the muscle tissue of blood vessels and increasing blood flow to the genital areas. This medicine contains sildenafil citrate ingredient which helps in getting erection. This tablet is to be taken 30 to 60 minutes before sexual activity. Overdose of this drug should be absolutely avoided. The erection period is usually 4 to 5 hours. Take this medicine with sufficient amount of water and do not chew or crush the medicine.