Fildena 100 can be taken on an empty stomach or with meals. It should be taken strictly as directed by the doctor. It should take about 1 hour before you plan to have s*x. The amount of time it takes to work varies from person to person, but it usually takes between 30 minutes and 1 hour. This medicine will only help you get an erection if you are s*xually stimulated. However, you shouldn't take this drug if you don't have erectile dysfunction. It shouldn't be taken more than once a day.