Zhewitra 40 mg improves blood float when a man is sexually excited. The blood vessels that provide the penis with blood enlarge, and the veins that take blood other than the penis contract - the 2 big chambers in the penis, known as the corpus cavernosa, stuff with blood. Zhewitra 40 mg tablets are laboured to treat male sexual feature problems (impotence or Erectile dysfunction-ED). In mixture with physical stimulation, Vardenafil 40 mg works by means of raising blood flow to the penis to help a person get and keep an erection.