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

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   In a study comparing the effects of sildenafil and bosentan ... How Long Does Viagra Take to Work? Viagra usually starts working 30 to 60 minutes after taking it. But simply swallowing the little ...

3. How to Take Viagra for Best Results - AOL

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   Below, we’ve covered how you can take Viagra or generic sildenafil for optimal results, from the best time to take Viagra before intercourse to drug interactions and adverse effects that you ...

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

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   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.

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

6. 5 Must-Know Tips Before Taking Sildenafil 100mg - AOL

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   For example, in clinical trials of sildenafil, 28 percent of men reported headache (by far the most common side effect) at a dosage of 100mg, compared to just 16 percent of men who used 25mg and ...

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.