Sildenafil acts as the active ingredient in Fildena 100 Mg pills. Fildena 100 is to be taken one hour before sex. The effect of indigestion which is taken remains for 5-6 hours. Before taking Fildena 100mg, it is advisable to consult a doctor. Fildena 100mg should be used once a day. Fildena 100 Mg is a drug for male use only, so women should not use these pills.