The purpose of the Fildena Double 200 mg tablet is to treat male impotence over the long term. If you forget to take this prescription, take it as soon as you remember. You should take this medication once every 24 hours. Take this medication only seldom.  Go to fildena.us.com to find out more. When male erectile dysfunction becomes a serious problem, it enters the first stage. There aren't any ED drugs on the market to deal with this problem.