Fildena is also found in different strengths. Fildena is known as a magic bullet. Is the best drug used by men? Sildenafil acts as the active ingredient in Fildena. This is one of the best drugs to solve the sexual problem. Which is used more to solve the problem of your ED. Fildena is the best drug used by men. It is advisable to keep away from small children and pets. Fildena should be used only once a day.