An effective medication for treating erectile dysfunction and impotence in males is Fildena Double 200. A component in this medication called sildenafil helps men achieve a powerful erection during sexual activity. Take this medication half an hour before sexual activity. Consume water together with this medication. This medication can be used either before or after a meal. The medication Fildena Double 200 has a 4- to 6-hour half-life. This is a male-only medicine. Follow your doctor's advice when taking this medication.