fildena tablet is used to treat men suffering from erectile dysfunction. Sildenafil citrate is found as a common 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. And if you want to take this medicine with food, don't take fatty food as it increases the side effects of this medicine.