Vidalista 20 Erectile dysfunction occurs due to inadequate blood flow to the penile tissue. Blood flow can decrease due to any medical condition that affects the reproductive organs or as a side effect of the use of certain medications. And most of the time, psychological conditions affect s*xual health. Like Viagra or Cialis, Vidalista acts on the smooth muscle and blood vessels of the p*nis. When s*xually aroused, nitric oxide is released inside the p*nis. Nitric acid promotes the production of a Vidalista 40 chemical known as cyclic guanosine monophosphate (cGMP) which controls blood flow to the penis by controlling the contraction and dilation of blood vessels.