How is viagra able to divert blood flow to a particular part of the body ? and can it be used for other body parts also ?
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In all blood vessels, nitric oxide enhances vasodilation, and phosphodiesterase inhibits vasodilation. Viagra is a PDE inhibitor so net effect is more vasodilation. More vasodilation = more blood flow to small vessels = erection. But this vasodilation is global. It opens up vessels everywhere, so much so that if you take any other blood pressure medication, you will have such a drop in BP that you will faint. And yes, its used to treat high blood pressure in the vessels in your lungs (pulmonary hypertension)
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