Zhewitra 40 mg works by increasing blood flow to the penis, helping men achieve and maintain erections during sexual stimulation. The active ingredient, Vardenafil, inhibits the action of the PDE5 enzyme, leading to the accumulation of cyclic guanosine monophosphate (cGMP) in the penile tissues. This results in the relaxation of the smooth muscles in the blood vessels of the penis, allowing for increased blood flow to the erectile tissues and the ability to achieve firm and lasting erections.

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