Zhewitra 40 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient vardenafil, which belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. Vardenafil works by increasing blood flow to the penis during sexual stimulation. It inhibits the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down cyclic guanosine monophosphate (cGMP), a substance that relaxes smooth muscles in the penis and allows blood to flow into the penile tissues, resulting in an erection. https://www.genericday.com/zhewitra-40-mg.html