Men with erectile dysfunction and impotence can be treated with fildena medication. This medication should only be used by men. Sildenafil Citrate is a component in this medication that helps men achieve a powerful erection during sexual activity. This medication has a 4 to 6-hour half-life. You can take this medication any way—before or after food. Follow your doctor's advice when taking this medication. This medication should be taken by men 30 minutes before sexual activity.