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Fildena XXX 100mg contains Sildenafil Citrate Salt. The common mechanism behind penile erection is the release of nitric oxide. It is released into the corpus cavernosum of nitric oxide, which is the muscle present in the penis. It activates the enzyme nitric oxide guanylate cyclase which increases cGMP levels. Increased levels of cGMP relax the penile blood vessels present in the corpora cavernosa and increase blood flow to the penis leading to erections. Sildenafil citrate helps increase the effect of nitric oxide by inhibiting phosphodiesterase-5, which degrades cGMP by nitric oxide in penile blood vessels.