Fildena Double 200 mg is a treatment for adult men with erectile dysfunction. This is when a man cannot get or keep an erection hard enough for satisfactory sexual activity. Erections depend on many things, including proper blood flow to the penis. If blood cannot flow adequately to the penis, it can cause erectile dysfunction. Erectile dysfunction is a common problem and can affect men differently. Fildena Double 200 mg works by relaxing the blood vessels in your penis, allowing blood to flow into your penis when you get sexually excited and causing an erection. Sildenafil will only help you to get an erection if you are sexually excited.