Fildena 150 mg contains an active ingredient Sildenafil which is FDA-approved medication used to treat erectile dysfunction problems in men. After being introduced in 1998, Fildena 150mg became the most popular treatment for erectile dysfunction issues. Fildena 150mg is a fast-acting medication that can last up to four hours. It works well for men at any age, regardless of how long the patient has been having issues getting and maintaining an erection.