Fildena tablets are also found in different strengths. Sildenafil acts as the active ingredient in Fildena A tablets, taken one hour before sex, after which the effect lasts for 5-6 hours. It is important to consult a doctor before taking Fildena A. These tablets are widely used to treat the problem of ED. Fildena must be taken only once in 24 hours. Fildena is one of the best pills used by men.