Filagra is a brand name for a generic medication that contains sildenafil citrate as its active ingredient. Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor, and it is commonly used to treat erectile dysfunction (ED) in men. Sildenafil citrate works by inhibiting the enzyme phosphodiesterase type 5 (PDE5). This inhibition increases the levels of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. Elevated cGMP levels lead to relaxation of the smooth muscle, allowing increased blood flow to the penis and facilitating an erection.
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