Viagra, Levitra and Cialis prevent the breakdown of nitric oxide, a chemical messenger that promotes relaxation and opening of the blood vessels that supply erectile tissue in the penis. Under the influence of nitric oxide, these vessels expand and stay dilated. Increased blood flow makes erectile tissue swell and compress the veins that carry blood out of the penis, resulting in a full erection.
PDE-5 inhibitors do not automatically compare trigger erections. Sexual stimulation also is needed to start the whole process. The medications enable a more complete response to sexual stimulation.
This is a part of article Compare Viagra, Levitra and Cialis: How they work Taken from "Cialis Compare Levitra Viagra" Information Blog
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