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  2. How to Take Viagra for Best Results - AOL

    www.aol.com/viagra-best-results-105700318.html

    How to Use Viagra for Best Results. Viagra is great as an ED treatment, but taking it in particular conditions can make it even more effective. To get the best results from Viagra when treating ...

  3. Viagra: What It Treats & Its Side Effects ( Plus What It Was ...

    www.aol.com/viagra-treats-side-effects-plus...

    Generic sildenafil (and brand-name Viagra) is a medication for the treatment of ED, Raynaud’s phenomenon, and pulmonary arterial hypertension. To understand how Viagra works, we need to look at ...

  4. 4 Common ED Pills: Weighing the Pros & Cons of Each - AOL

    www.aol.com/4-common-ed-pills-weighing-141800609...

    Sildenafil (Viagra) and vardenafil (Levitra) are short-acting. These “one-night” ED medications are both available as generics, making them good medications to try first. Tadalafil (Cialis) is ...

  5. 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]

  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. 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 ...

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