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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. Vardenafil - Wikipedia

    en.wikipedia.org/wiki/Vardenafil

    Vardenafil 4 tablets Blister 20 mg Vardenafil , sold under the brand name Levitra among others, is a medication that is used for treating erectile dysfunction . [ 1 ] [ 2 ] It is a PDE5 inhibitor . [ 1 ]

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

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

    Vardenafil is the active ingredient in Levitra, and was approved by the FDA in 2003. Vardenafil is similar to sildenafil but lasts longer, with research suggesting that it provides better blood ...

  5. Is It Safe to Take Cialis Daily? - AOL

    www.aol.com/safe-cialis-daily-115900442.html

    Vardenafil. The active ingredient in Levitra, vardenafil can provide relief from ED for up to six hours per dose. Similar to sildenafil, it can be taken once per day and works best as a medication ...

  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. Sildenafil - Wikipedia

    en.wikipedia.org/wiki/Sildenafil

    20 minutes: Elimination half-life: ... a 25 mg dose was shown to cause no significant change in erectile quality, ... and vardenafil (Levitra).

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