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Fildena 100 is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. When sexually aroused, the body releases nitric oxide, which triggers the production of cyclic guanosine monophosphate (cGMP). This chemical helps relax the smooth muscles in the penis,