Fildena is a medication that contains Sildenafil Citrate, which is primarily used to treat erectile dysfunction (ED) in men. It belongs to a class of drugs known as PDE5 inhibitors, which work by increasing blood flow to the pill, helping men achieve and maintain an erection when physical aroused. Sildenafil (the active ingredient in Fildena) works by inhibiting phosphodiesterase type 5 (PDE5), an enzyme that breaks down cGMP (cyclic guanosine monophosphate). cGMP is involved in relaxing the smooth muscles of blood vessels, allowing them to dilate and increase blood flow to the pill. https://www.genericday.com/fildena.html