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

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   How Long Does Viagra Last? This medication works for about four hours. So after taking Viagra, you should be able to get and maintain being hard enough (again, with stimulation) within that window.

3. 4 Common ED Pills: Weighing the Pros & Cons of Each - AOL

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   Its long duration means side effects could last longer than with other ED pills. Tadalafil Pros Tadalafil has a half-life of 17.5 hours — it remains active in your body for far longer than other ...

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

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   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. 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 ]

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. Got Headaches from Viagra or Cialis? Here's Why & How to Treat It

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   Headaches are a common side effect of ED medications such as sildenafil (the active ingredient in Viagra), tadalafil (Cialis) and vardenafil (Levitra), with about 25 percent of men prescribed ...