Fildena is a brand of generic medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which is also the active ingredient in Viagra, a well-known brand for ED treatment. Sildenafil citrate works by relaxing muscles and increasing blood flow to particular areas of the body, specifically the penis, which helps men achieve and maintain an erection suitable for sexual activity. It is typically taken orally, as needed, about 30 minutes to 1 hour before sexual activity. The effects of Fildena can last for up to 4-6 hours after taking the medication. It's important to note that Fildena should only be used under the supervision of a healthcare provider.