Zhewitra 20 mg contains Vardenafil which magnifies the sex drive of men by relaxing the blood vessels that regulate proper blood flow to penile. It is mainly Vardenafil used for erectile dysfunction like Sildenafil Citrate, Vardenafil is also phosphodiesterase type 5 inhibitor which leads to increase in concentration of cGMP in body leading to muscle relaxation and increase in blood flow.