Fildena 100 is a medication commonly used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors. Fildena 100 is primarily used to improve blood flow to the penis, which helps men with ED achieve and sustain an erection when sexually aroused. It does not cause spontaneous erections and requires sexual stimulation to be effective. The active ingredient, sildenafil citrate, works by inhibiting the action of PDE5, an enzyme that regulates blood flow in the penis. By blocking PDE5, Fildena 100 allows the blood vessels in the penis to relax and dilate, increasing blood flow and facilitating an erection.