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

3. How to Pay the Lowest Price for Cialis & Tadalafil - AOL

   www.aol.com/lifestyle/pay-lowest-price-cialis...

   The price per dose of Viagra is higher than Cialis. Viagra ranges from $86 to $116 a pill. Meanwhile, Cialis is more like $15 to $83 per dose, depending on the dosage and whether it’s the daily ...

4. 4 Surprising Uses of Viagra (Including What It Was Really ...

   www.aol.com/4-surprising-uses-viagara-including...

   Generic sildenafil (and brand-name Viagra) is a medication for the treatment of ED, Raynaud’s phenomenon, and pulmonary arterial hypertension. To understand how Viagra works, we need to look at ...

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

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

   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.

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. Online pharmacy - Wikipedia

   en.wikipedia.org/wiki/Online_pharmacy

   A study in three cities in the Netherlands found that over 60% of the consumed sildenafil was obtained from illegal sources. [12] Roger Bate from the American Enterprise Institute tested hundreds of prescription drug orders purchased over the Internet and discovered that properly credentialed online pharmacies, ones selling domestically and ...

8. 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.

9. Vardenafil - Wikipedia

   en.wikipedia.org/wiki/Vardenafil

   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 ethyl group. Tadalafil is structurally different from both sildenafil and vardenafil. Vardenafil's relatively short effective time is comparable to but somewhat longer than ...