Sildenafil acts as the active ingredient in Fildena 120. These pills are to be taken 30 minutes before sexual intercourse. After taking it, its effect lasts for several hours, its effect lasts for 5-6 hours. After taking it, its effect remains. A doctor must be consulted before taking Fildena 120. These pills are widely used. These are the most popular tablets for sex-related problems. Fildena 120 is more commonly used to treat erectile dysfunction.