here you can get all the information you want. very detailed and yet understanable! http://health.howstuffworks.com/viagra.htm

During sexual stimulation, nitric oxide (NO) is released in the corpora cavernosa (two cylinders of spongy erectile tissue in the penis). The nitric oxide activates an enzyme called guanylate cyclase, increasing levels of a smooth-muscle relaxant known as cyclic guanosine monophosphate (cGMP). Smooth muscle acts involuntarily -- the conscious mind has no control over its actions. This kind of muscle is located in blood vessels, intestines, the stomach, and other areas. When Viagra (sildenafil) is tossed into the equation, it inhibits the effect of phosphodiesterase type 5 (PDE5) and enhances the effect of NO. Normally, PDE5 degrades cGMP. With sildenafil present, the increased levels of cGMP cause smooth muscle relaxation. Consequently, blood can flow into the corpora cavernosa more easily. In a normal erection, these two cylinders hold 90% of the blood that flows into the penis, with the balance going to the corpus spongiosum, a smaller cylinder containing the urethra. Interestingly, this plays a role in one of Viagra's more unsual side effects. Some men who take this drug develop a bluish cast to their vision or have difficulty telling blue from green. Sildenafil is selective for PDE5, which means it has a greater effect on that particular phosphodiesterase than it does on others. In fact, it is 4,000 times more selective for PDE5 than for PDE3, which is responsible for heart muscle contraction! Unfortunately, it is only 10 times more selective for PDE6, an enzyme found in the retina and involved in phototransduction. * Prescribing information for Viagra: http://www.pfizer.com/download/uspi_viagra.pdf * Pretty much what is stated above, but with a nice, colorful diagram: http://health.howstuffworks.com/viagra5.htm * Phototransduction: http://wolfstone.halloweenhost.com/TechBase/litadv_AdvancedLightingConcept.html#HowDoRodsAndConesWork EDIT: As per Relsqui's request, a "paraphrase for laymen": Viagra causes smooth muscle relaxation, allowing blood to easily flow into the penis. Sometimes, Viagra will make your vision blue.

Pharmacist: Very well. Yes, it works well. Customer: Can I get it over the counter? Pharmacist: If you take two.

My brother said great

Ask the dozens of girls who are sore!!

Who Cares?

Viagra makes YOU work :-))

Well viagra does not give you an erection right after you take it. There needs to be sexual contact or arousal..... There is a great forum that only discusses viagra and the other ed meds like cialis. My husband is on it all day, the address is www.edguider.com Has good info on viagra and allot of success stories from viagra users...... Hope that helps......