Fildena 120 mg is a high-strength prescription medicine used to treat erectile dysfunction (ED) in adult men. It contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that improves blood flow to the penis during sexual stimulation, helping achieve and maintain a firm erection. The mechanism of action involves blocking the PDE5 enzyme, which normally breaks down cyclic guanosine monophosphate (cGMP). When PDE5 is inhibited, cGMP levels remain elevated, leading to relaxation of smooth muscles and dilation of blood vessels in the penile region.

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