All men should know the main cause of its origin before taking fildena 100 for ED and the main reason for the emergence of ED is the lack of blood flowing to the penis. The penis cannot receive enough blood when the blood vessels that carry blood to the penis begin to constrict due to the stressful life. Fildena medicine works by removing the ED problem permanently and providing solid erection to all men naturally. After taking fildena medicine, as a result all ED men will be able to have sex and get erection longer.