Fildena Double is a prescription drug used to treat erectile dysfunction (ED) in men.It contains sildenafil citrate, which belongs to a class of drugs called PDE-5 inhibitors. Fildena works by increasing blood flow to the penile region. This gives men strength and allows men to get and maintain an erection. It also relaxes the spongy muscles around the pelvis. This reduces recovery time and allows men to have stronger erections and regain their hardness after each sexual session.