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

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

   Other more serious but less common side effects of Viagra have also been reported, such as: ... Sildenafil is most commonly prescribed to be taken one time per day in doses between 25 and 100 mg ...

3. 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] It is unclear if it is effective for treating sexual dysfunction in females. [8]

4. How to Take Viagra for Best Results - AOL

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

   Viagra side effects may affect your ability to perform, though most are mild and temporary. All (ED) medications work best when you’re maintaining a healthy lifestyle. That’s the 30-thousand ...

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

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

   Side Effects of Viagra Use. Like any medication, side effects of Viagra may come with its many benefits. Still, Viagra is safe when used as directed. Viagra may cause common side effects, including:

6. How Much Viagra Is Too Much? - AOL

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

   Whether you use sildenafil or Viagra, take a 100-milligram sildenafil dose or a 20-milligram sildenafil dose, the effects of sildenafil won’t just get you hard when you don’t want to. The drug ...

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. Discovery and development of phosphodiesterase 5 inhibitors

   en.wikipedia.org/wiki/Discovery_and_development...

   Sildenafil did not prove effective for coronary heart disease but an interesting side effect was discovered, a penile erection. That side effect soon became the main field of investigation. [23] The inhibitor is highly selective for the PDE5 family. [22] Sildenafil is a prototype of PDE5 inhibitors that Pfizer launched as Viagra.

9. 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 ...