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2. What Happens If You Take Viagra and You Don't Need It? - AOL

   www.aol.com/happens-viagra-dont-105800158.html

   Viagra could lead to more serious side effects, such as: Priapism (a painful, long-lasting arousal) Vision loss. Chest pain. ... Brand-name ED drugs like Cialis (tadalafil), Levitra ...

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

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

   Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) typically start working within 30 to 60 minutes, while avanafil (Stendra) works within 15 to 30 minutes. As with most prescription ...

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

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

   Most men and women know at least vaguely what Viagra does, but not everyone knows how it does it. ... Other medications for ED, like Cialis (tadalafil), Levitra (vardenafil), and Stendra (avanafil ...

5. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   In 2000, Viagra sales accounted for 92% of the global market for prescribed erectile dysfunction pills. [77] By 2007, Viagra's global share had plunged to about 50% [78] due to several factors, including the entry of Cialis and Levitra, along with several counterfeits and clones, and reports of vision loss in people taking PDE5 inhibitors.

6. What Is the Safest ED Medication? - AOL

   www.aol.com/safest-ed-medication-105700669.html

   Viagra (sildenafil), Cialis (tadalafil), Levitra (vardenafil), Stendra (avanafil) and Caverject (alprostadil) are all FDA-approved for the treatment of ED and safe for most men to use.

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

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

   Although Cialis and Viagra both make it easier to get and maintain an erection, there are a few key differences between these two ED medications that may make one a better choice than the other ...

8. 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.

9. How to Take Viagra for Best Results - AOL

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

   Viagra isn’t the only PDE5 inhibitor on the market. In fact, the FDA has approved three other PDE5 inhibitors to help treat the symptoms of ED: Cialis (tadalafil) Levitra (vardenafil) Stendra ...