Zhewitra 20 mg is a medication containing the active ingredient vardenafil, which is primarily used to treat erectile dysfunction (ED) in men. Vardenafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors, similar to sildenafil (Viagra) and tadalafil (Cialis). Vardenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for the degradation of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. https://www.genericday.com/zhewitra-20-mg.html