As needed, use Fildena 200 prior to sexual activity. The ideal time to take Fildena 200 is around an hour before sexual activity, while you can take the drug up to 30 minutes or 4 hours beforehand. Typically, Fildena 200 shouldn't be taken more frequently than once per 24 hours. Fildena 200 can be taken with or without food. It functions by expanding and relaxing the blood arteries in your lungs, which facilitates easier blood flow.