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2. Facing Off Against Counterfeit Online Pharmacies: Pfizer ...

   www.aol.com/news/2013-05-06-facing-off-against...

   In 2011, Pfizer Global Security evaluated 22 websites appearing in the top search results for the phrase "buy Viagra" and conducted chemical analysis of the pills advertised as Pfizer's Viagra ...

3. 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.

4. Is Sildenafil Safe for This Common Male Problem? - AOL

   www.aol.com/sildenafil-safe-common-male-problem...

   After further trials, sildenafil citrate was approved by the Food and Drug Administration (FDA) in 1998 as the active ingredient in brand name Viagra, now a very well-known drug for ED.

5. 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.

6. List of largest selling pharmaceutical products - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_selling...

   10 rituximab: non-Hodgkin's lymphoma: Rituxan, MabThera 6750 7298 11 rivaroxaban: anticoagulant: Xarelto 6589 6234 12 aflibercept: Eylea 6551 5830 13 infliximab: Remicade 5908 7152 14 Pneumococcal conjugate vaccine: Prevnar 13 Prevenar 13 5802 5601 15 ustekinumab: Stelara 5156 4011 16 pregabalin: epilepsy: Lyrica 4970 5065

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

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

   If you struggle with ED, drugs like Viagra®, sildenafil, tadalafil, and other FDA-approved medications could help with your performance. But if you’re not prescribed one of these meds, taking ...