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Nitric oxide acts as a signaling molecule and stimulates an enzyme called guanylate cyclase in nearby cells.When the brain stops sending the signal, all of the cGMP goes away because PDE is deactivating it.The cGMP causes arteries in the corpora cavernosa to dilate, causing lots of blood to flow into the penis.The side effect of headache can often be combated by taking a non-steroidal anti.

There is a cycle -- guanylate cyclase turns GTP into cGMP, and PDE turns cGMP into GTP.

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Find patient medical information for Viagra oral on WebMD including its uses, side effects and safety, interactions,.Due to combat muscle below are useful in your essay, paper include, upper limit skin.Does using Viagra regularly over a long period of time have any adverse effects.Viagra was first introduced in 1988 as a medication to treat erectile dysfunction, or ED.

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The guanylate cyclase converts a chemical called GTP into another chemical called cGMP. cGMP causes muscles in the walls of the arteries to relax.Consumer information about the medication SILDENAFIL (ERECTILE DYSFUNCTION) - ORAL (Viagra),. oral, viagra drug. to report negative side effects of.

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