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

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

    Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) typically start working within 30 to 60 minutes, while avanafil (Stendra) works within 15 to 30 minutes. As with most prescription ...

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

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

    Advantages: Vardenafil lasts for longer than sildenafil and usually starts working faster. Disadvantages: Vardenafil is typically more expensive than sildenafil. Like sildenafil, it can only be ...

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

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

    Participants started off on 100 milligrams of sildenafil for three days before moving on to 200 milligrams for two days. ... How Long Does Viagra Last? This medication works for about four hours ...

  5. 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 ...

  6. 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]

  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.

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