Sildenafil acts as the main ingredient in Fildena 25 drugs. Fildena 25 is mainly taken 1 hour before intercourse, which helps to prolong the erection time after you take it. It is important to consult a doctor before taking Fildena 25mg. Fildena 25 is not a pill for women to use so she and young children should not use these tablets. Fildena 25 Mg should be taken only once a day.