Sildenafil
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Sildenafil citrate, sold as Viagra, Revatio and under various other trade names, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It was originally developed by British scientists and then brought to market by the US-based pharmaceutical company Pfizer. It acts by inhibiting cGMP-specific phosphodiesterase type 5, an enzyme that promotes degradation of cGMP, which regulates blood flow in the penis. Since becoming available in 1998, sildenafil has been the prime treatment for erectile dysfunction; its primary competitors on the market are tadalafil (Cialis) and vardenafil (Levitra).
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| Official Viagra Website Official Viagra Website www.viagra.com - Web |
| Official Viagra UK Website Official Viagra UK Website www.viagra.co.uk - Web |
| Official Revatio Website Official Revatio Website www.revatio.com - Web |
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| prescribing information for Viagra prescribing information for Viagra www.pfizer.com/files/products/uspi_viagra.pdf - Web |
| FDA Information FDA Information www.fda.gov/.../ucm162833.htm - Web |
| MedlinePLUS information, including side effects MedlinePLUS information, including side effects www.nlm.nih.gov/medlineplus/druginfo/meds/a699015.html - Web |
| U.S. National Library of Medicine: Drug Informatio... U.S. National Library of Medicine: Drug Information Portal - Sildenafil druginfo.nlm.nih.gov/drugportal/dpdirect.jsp?name=Sildenafil - Web |
| Viagra bound to proteins Viagra bound to proteins www.ebi.ac.uk/pdbe-srv/PDBeXplore/ligand/?ligand=VIA - Web |
