Fildena 100 mg 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. Sildenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for the breakdown of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. When a man is sexually stimulated, nitric oxide is released in the erectile tissue, which activates an enzyme called guanylate cyclase.

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