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2. 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]

3. Over-the-counter drug - Wikipedia

   en.wikipedia.org/wiki/Over-the-counter_drug

   Over-the-counter (OTC) medicines at FamilyDoctor.org, maintained by the American Academy of Family Physicians. Contains extensive information on over-the-counter drugs and their responsible use, including specific guidance on several drug classes in question-and-answer format and information on common drug interactions.

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

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

   Viagra has made its way into medicine cabinets the world over as a trusted medication for ED and cardiovascular health. We know intimate activity is supposed to be somewhat off the cuff, but you ...

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

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

   Whether you’re one of the 30 million men who have (ED) or not, you’ve almost certainly heard of Viagra. Maybe you even know about other ED medications, like Levitra or Stendra or Cialis, too.

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

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

   Recreational Viagra use does happen, and while some men see harmless benefits from the active ingredient in the famous “little blue pill,” they’re still taking a significant risk every time ...

7. 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.