Fildena is a medication primarily used to treat erectile dysfunction (ED), a common condition in men where achieving or maintaining an erection becomes difficult or impossible. The active ingredient in Fildena is sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. This class of medication works by relaxing the muscles in the blood vessels of the penis, increasing blood flow when a man is sexually stimulated. As a result, Fildena helps men with ED to achieve and sustain an erection sufficient for sexual intercourse. The purpose of Fildena extends beyond merely improving erectile function.