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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 ]

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

   www.aol.com/4-common-ed-pills-weighing-141800609...

   Sildenafil is the OG prescription medication for ED. It came onto the market in the late ’90s under the brand name Viagra. For several years, it was the only medication available for men with ED.

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. What Happens If You Take Viagra and You Don't Need It? - AOL

   www.aol.com/happens-viagra-dont-105800158.html

   In many of these studies, the researchers found more than 10 percent of men having intimacy with men used sildenafil citrate — and that its use is associated with higher risks of unprotected ...

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. Erectile dysfunction - Wikipedia

   en.wikipedia.org/wiki/Erectile_dysfunction

   Sildenafil, Tadalafil, Vardenafil [13] Erectile dysfunction ( ED ), also referred to as impotence , is a form of sexual dysfunction in males characterized by the persistent or recurring inability to achieve or maintain a penile erection with sufficient rigidity and duration for satisfactory sexual activity .

8. How Much Viagra Is Too Much? - AOL

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

   Sildenafil is the active ingredient in the medication and the name for generic Viagra. Viagra and Revatio are the drug’s brand names. Viagra doses range from 25 to 100 milligrams (mg). A typical ...

9. 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 ...