Sildenafil citrate is the active ingredient in Kamagra 100 mg. It is the same active ingredient found in Viagra, a well-known medication for ED. Sildenafil inhibits the PDE5 enzyme, which normally breaks down cyclic guanosine monophosphate (cGMP). By inhibiting PDE5, sildenafil increases cGMP levels, leading to relaxation of the smooth muscles in the blood vessels of the penis and increased blood flow.


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