Fildena 120 is another medication used to treat erectile dysfunction (ED), it contains sildenafil citrate as the active ingredient. Sildenafil is a well-known drug that works by relaxing the blood vessels in the penis, which increases blood flow, helping men achieve and maintain an erection during sexual stimulation. Fildena 120 should be taken approximately 30 to 60 minutes before sexual activity, and its effects can last for 4 to 6 hours.