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2. Things You Probably Don't Know About Viagra (Like What ... - AOL

   www.aol.com/things-probably-dont-know-viagra...

   Generic sildenafil (and brand-name Viagra) is a medication for the treatment of ED, Raynaud’s phenomenon, and pulmonary arterial hypertension. ... This is thanks to an enzyme called ...

3. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9]

4. Cialis vs. Viagra: How Are They Different? - AOL

   www.aol.com/cialis-vs-viagra-different-175700354...

   Cialis and Viagra, as well as their generic equivalents, belong to a class of drugs referred to as PDE5 inhibitors. These medications work by inhibiting the actions of an internal enzyme called ...

5. How Much Viagra Is Too Much? - AOL

   www.aol.com/much-viagra-too-much-105700581.html

   Sildenafil is the active ingredient in the medication and the name for generic Viagra. Viagra and Revatio are the drug’s brand names. Viagra doses range from 25 to 100 milligrams (mg).

6. PDE5 inhibitor - Wikipedia

   en.wikipedia.org/wiki/PDE5_inhibitor

   Chemical structure of sildenafil (Viagra), the prototypical PDE5 inhibitor. A phosphodiesterase type 5 inhibitor (PDE5 inhibitor) is a vasodilating drug that works by blocking the degradative action of cGMP-specific phosphodiesterase type 5 (PDE5) on cyclic GMP in the smooth muscle cells lining the blood vessels supplying various tissues.

7. List of drugs: X - Wikipedia

   en.wikipedia.org/wiki/List_of_drugs:_X

   Brand names and generic names are differentiated by capitalizing brand names. See also the list of the top 100 bestselling branded drugs, ranked by sales. Abbreviations are used in the list as follows: INN = International Nonproprietary Name; BAN = British Approved Name; USAN = United States Adopted Name; Two-letter codes for countries

8. Your ED Pill Guide: Everything You Need to Know Before ... - AOL

   www.aol.com/ed-pill-guide-everything-know...

   Viagra (or sildenafil) lasts three to five hours after it’s consumed. Cialis (tadalafil) has a half-life of 17.5 hours, meaning this drug lasts up to 36 hours after it’s consumed.

9. Vardenafil - Wikipedia

   en.wikipedia.org/wiki/Vardenafil

   Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...