Zhewitra 10 contains vardenafil, which is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED) in men. Zhewitra 10 works by inhibiting the enzyme PDE5 in the smooth muscle cells of the penis. This action leads to increased levels of cyclic guanosine monophosphate (cGMP), which helps relax the blood vessels and improve blood flow to the penis during sexual stimulation. As a result, men can achieve and maintain an erection suitable for sexual activity.