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2. How Much Viagra Is Too Much? - AOL

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

   Viagra or sildenafil, the active ingredient and generic version, is a PDE-5 inhibitor that widens blood vessels inside the member to allow better blood flow for stronger or longer-lasting arousal.

3. 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.

4. 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.

5. What Happens If You Take 2 Viagra In 24 Hours? - AOL

   www.aol.com/happens-2-viagra-24-hours-135700769.html

   But if you’re still experiencing ED with a 50 mg dose, your provider will typically prescribe the 100 mg Viagra pills instead. In rare cases (say, if the 100 mg pills are out of stock), they ...

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

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

   Below, we’ll explain the origin story of Viagra, what this boner-benefitting pill can do, the benefits of Viagra for men, and the potential side effects of taking it. samael334/istockphoto.