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viargra works by inhibiting an enzyme known as phosphodiesterase5 (PDE5). this enzymes function is to break down a chemical messanger known as cGMP(cyclic guaninine monophosphate). cGMP induces smooth muscle relaxation in the penis thereby allowing more blood to flow to it hence a boner. So when a man is sexually stimulated normally NO is released which tells an enzyme called guanylate cyclase to make cGMP. However many men with erectile dysfunction do not produce enough NO and so this is sort of a biochemical trick to bypass that by not allowing cGMP to break down hence why viagra from what ive heard gives you a hard on for a very long time. id imagine other male enhancment pills work in some similar fashion. oh and by the way i never tried them hah i just had to laern a bit about viagra in a biochemistry class.
(Message edited by Burnt on January 12, 2005)
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