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2. Things You Probably Don't Know About Viagra (Like What It Was ...

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

   Whether you’re a senior in high school or a senior-living resident, you’ve likely heard of Viagra (sildenafil) — the original medication for ED. Most men and women know at least vaguely what ...

3. 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 ...

4. 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.

5. 4 Common ED Pills: Weighing the Pros & Cons of Each - AOL

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

   The Best ED Medication for Men: Pros & Cons of Top ED Pills. Over the last 25 years, (ED) medications like Viagra and Cialis have become common fixtures in bedrooms around the world.

6. Erectile dysfunction - Wikipedia

   en.wikipedia.org/wiki/Erectile_dysfunction

   Erectile dysfunction (ED), also referred to as impotence, is a form of sexual dysfunction in males characterized by the persistent or recurring inability to achieve or maintain a penile erection with sufficient rigidity and duration for satisfactory sexual activity.

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.

8. What Is the Safest ED Medication? - AOL

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

   For most men who use ED medications, these side effects aren’t serious. As a newer, more selective medication for ED, avanafil (Stendra) is less likely to produce certain side effects than other ...

9. cGMP-specific phosphodiesterase type 5 - Wikipedia

   en.wikipedia.org/wiki/CGMP-specific_phosphodi...

   The most commonly available PDE5 inhibitors are sildenafil (Viagra), [14] vardenafil (Levitra), [15] tadalafil (Cialis), [16] and avanafil (Stendra). [17] PDE5 inhibitors are not routinely prescribed as first line treatment for erectile dysfunction. This is as they cause unwanted side effects like hair loss, headache, and nausea (among others ...