Fildena 100 tablets can last up to six hours, and have been clinically proven to be effective for men with erectile dysfunction. They are taken one hour before intercourse, and are believed to help men achieve a long-lasting erection for up to 6 hours. This medication is an excellent alternative to Viagra for men who have trouble getting an erection. Fildena 100 mg is the most effective generic medicine. It is a PDE5 inhibitor, and is prescribed for men who have erectile dysfunction. It works by relaxing the muscles of the blood vessels and improving blood flow to the penis. As a result, it improves erections and can even help men with PAH. More than thirty million men in the United States are affected by erectile dysfunction, which is one of the most common health conditions in men.