Men with erectile dysfunction (ED) are the main patients for the medicine Fildena 100 mg. A phosphodiesterase type 5 (PDE5) inhibitor, sildenafil citrate (100 mg) increases blood flow to the penis and facilitates an erection when sexually stimulated. The purpose of Fildena 100 is to assist men in getting and keeping an erection during intercourse. It functions by allowing for more blood flow by relaxing the blood arteries of the penis.