Filagra is a medication commonly used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate as its active ingredient, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which increases the levels of cyclic guanosine monophosphate (cGMP) in the penis. This leads to relaxation of the blood vessels, allowing increased blood flow during sexual arousal, resulting in an erection.

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