fildena ct 50mg for the treatment of men suffering from erectile dysfunction the tablet has been used. Sildenafil citrate is found as the active ingredient in this medicine. The effect of this drug lasts for 4 to 6 hours. And if the effect of this medicine lasts for more than 6 hours, seek the help of a doctor immediately. This medicine can be taken with or without food. But do not take this medicine with heavy meals.