This chemical works in the muscles and blood vessels of the pelvic organs, relaxing both and increasing the blood supply. The resulting effect creates natural conditions for an erection. It happens easily, and only if properly stimulated, avoiding unnecessary erections at the least opportune moments. The action occurs 40 minutes after taking the pill. The difference between Kamagra online and Viagra is that the effect of the gel is faster because it begins to be absorbed by the body already in the oral cavity.