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What links here Related changes Upload file Special pages Permanent link Page information Wikidata item Cite this page.Other drugs that operate by the same mechanism include tadalafil (Cialis) and vardenafil (Levitra).

Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects.Common side effects include headaches and heartburn, as well as flushed skin.Viagra at The Periodic Table of Videos (University of Nottingham).In February 2007, it was announced that Boots, the UK pharmacy chain, would try over-the-counter sales of Viagra in stores in Manchester, England.

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Main page Contents Featured content Current events Random article Donate to Wikipedia Wikipedia store.Furchgott, Ferid Murad, and Louis Ignarro won the Nobel Prize in Physiology or Medicine in 1998 for their independent study of the metabolic pathway of nitric oxide in smooth muscle vasodilation.

Sildenafil is a potent and selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum.

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Includes Viagra side effects, interactions and indications.Sildenafil is broken down in the liver by hepatic metabolism using cytochrome p450 enzymes, mainly CYP450 3A4(major route), but also by CYP2C9 (minor route) hepatic isoenzymes.The patent on Revatio (indicated for pulmonary arterial hypertension rather than erectile dysfunction) expired in late 2012.Drugs for erectile dysfunction ( G04BE ) and premature ejaculation.Read the informative research article by Jim Edwards from BNET, to see what will happen with Authentic Viagra.

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See also: Drugs for erectile dysfunction and premature ejaculation.

Pfizer Inc. has shot off a patent infringement suit against generic-drug maker Teva Pharmaceuticals USA Inc., seeking to stop the sale of a copycat version of.Medications used in the management of pulmonary arterial hypertension ( B01, C02 ).

Good news for frugal guys with erection troubles: America will soon be up to its eyeballs in generic Viagra.Pfizer Inc. has reached a settlement with Teva Pharmaceuticals that allows the generic drugmaker to launch a copycat version of its popular erectile dysfun.Pfizer Where Can I By Singapore Viagra Generic Viagra In Get.

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Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection.

Sildenafil, sold as the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension.