How does exactly Viagra work?

Does it eventually make men erect on its own or does he have to be sexually aroused first?
Answers:
Little of both, it increase the flow of blood, it open blood vessels, you should really look under webmd, they explain everything.
i am not 100% sure exactly how it works and i have never used it but i have hear stories of other people that have used it, i believe that the explanation goes something close to this that viagra stimulates your body to produce a chemical and or hormone whose name i believe is nitrous oxide or something like that i am not 100% sure exactly what that name is and that nitrous oxide help to dilate your blood vessels and by so doing it allows more blood to go into your penis causing you to become sexuially aroused and also make your penis become erecrt i also believe that it eventually makes men erect on its own but i am not sure about that like i articulate i have never used it but i have heard poeple chitchat about it and a few months back i saw a t.v. commercial about viagra on t.v. several times. I hold also heard that if you have heart problems or other serious medical problems you should ask your doctor if your heart is healthy and strong ample so that you can use viagra because I have heard that sometimes people die when they use viagra from a heart attack because their heart is not stout and strong enough for the use of viagra. HOPING THAT THIS INFORMATION IS OF SOME HELP AND SERVICE TO YOU MAY GOD BLESS YOU AND YOURS INFINITELY AND MAY GOD BLESS THE USA INFINITELY. Source(s): my source is what other people have told me roughly speaking it and what i have seen on television in the order of it.
The mechanism of feat of Sildenafil citrate involves the release of nitric oxide (NO) in the corpus cavernosum of the penis. NO binds to the receptors of the enzyme guanylate cyclase which results in increased levels of cyclic guanosine monophosphate (cGMP), foremost to smooth muscle relaxation (vasodilation) of the intimal cushions of the helicine arteries, resulting in increased inflow of blood and an erection.

http://en.wikipedia.org/wiki/Viagra#Mech…
By increasing the blood flow within the area.

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