Fildena 25 mg is a medication primarily used to treat erectile dysfunction. The active ingredient in Fildena 25 mg is Sildenafil Citrate, a well-known compound in the treatment of ED. Sildenafil Citrate is also the active ingredient in Viagra, another widely recognized ED medication. The 25 mg dosage is typically used for those who may require a lower dose, such as individuals who are sensitive to medications or those new to ED treatments. To understand how Fildena 25 mg works, it’s important to grasp the physiological processes involved in achieving an erection. During arousal, the body releases nitric oxide (NO) in the. Nitric oxide stimulates the enzyme guanylate cyclase, which increases levels of cyclic guanosine monophosphate (cGMP). cGMP causes the smooth muscles in the blood vessels of the to relax, allowing more blood to flow into the erectile tissues and resulting in an erection.