Fildena 25 can be taken on an empty stomach or with food. It should be taken strictly as prescribed by your doctor. You should take it approximately an hour before you plan on having sex. The time it takes to work varies from person to person, but it typically takes between 30 minutes and an hour. Fildena 25 medication will only help you achieve an erection if you are sexually stimulated. You should not use this medication if you do not have erectile dysfunction. You can take this medication before or after meals. This medication has a 4- to 6-hour duration of action.