Fildena is the best drug for those who have a problem with impotence. Sildenafil acts as the active ingredient in Fildena. Fildena is taken 1 hour before intercourse. Fildena vs Viagra tablets mainly helps in prolonging the erection time. Consult a doctor while taking Fildena drug. If you want to see its effect quickly before taking the Sildenafil drug, take it on an empty stomach.