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2. How Much Viagra Is Too Much? - AOL

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

   Viagra doses range from 25 to 100 milligrams (mg). A typical starting dose of Viagra or sildenafil dosage is 50 milligrams. Whether you use sildenafil or Viagra, take a 100-milligram sildenafil ...

3. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   In 2000, Viagra sales accounted for 92% of the global market for prescribed erectile dysfunction pills. [77] By 2007, Viagra's global share had plunged to about 50% [78] due to several factors, including the entry of Cialis and Levitra, along with several counterfeits and clones, and reports of vision loss in people taking PDE5 inhibitors.

4. 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.

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

   www.aol.com/weighing-pros-cons-4-common...

   Over the last 25 years, (ED) medications such as Viagra and others have become common and normal pieces of bedroom tool kit. These little pills have helped hundreds of millions of men all over the ...

6. 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 ...

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

   www.aol.com/lifestyle/viagra-treats-side-effects...

   Viagra usually starts working 30 to 60 minutes after taking it. But simply swallowing the little blue pill won’t automatically make you hard — you still have to be aroused, either through ...