Fildena is a medication commonly used to treat erectile dysfunction (ED). It contains sildenafil citrate, the same active ingredient found in Viagra. Sildenafil works by increasing blood flow to the penis, helping men with ED achieve and maintain an erection when sexually aroused. Fildena comes in various strengths, and it is usually taken as a pill about 30 minutes to an hour before sexual activity. However, like all medications, Fildena should be used under a doctor's supervision to ensure it is safe, especially if you have any pre-existing health conditions or are taking other medications.