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  2. Are There Any FDA-Approved Male Enhancement Pills? - AOL

    www.aol.com/fda-approved-male-enhancement-pills...

    Health Risks of Unsafe, Unapproved Enhancement Pills. Unscrupulous business practices are so commonplace in the non-prescription male enhancement pill racket that the FDA actually maintains a list ...

  3. 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 ...

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

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

    Over the last 25 years, (ED) medications like Viagra and Cialis have become common fixtures in bedrooms around the world. ... Tadalafil has a half-life of 17.5 hours — it remains active in your ...

  5. Icos - Wikipedia

    en.wikipedia.org/wiki/Icos

    Icos also manufactured antibodies for other biotechnology companies. Icos is best known for the development of tadalafil (Cialis), a drug used to treat erectile dysfunction. This drug was discovered by GlaxoSmithKline, developed by Icos, and manufactured and marketed in partnership with Eli Lilly. Boosted by a unique advertising campaign led by ...

  6. Tadalafil - Wikipedia

    en.wikipedia.org/wiki/Tadalafil

    Tadalafil is an annulated 2,5-diketopiperazine. [25] It is also a 1,2,3,4-tetrahydro-β-carboline. Tadalafil can be synthesized starting from (D)-tryptophan methyl ester and piperonal via a Pictet–Spengler reaction. This is followed by condensations with chloroacetyl chloride and methylamine to complete the diketopiperazine ring: [26]

  7. Avanafil - Wikipedia

    en.wikipedia.org/wiki/Avanafil

    Avanafil is a PDE5 inhibitor approved for erectile dysfunction by the FDA on April 27, 2012 [2] and by EMA on June 21, 2013. [3] Avanafil is sold under the brand names Stendra and Spedra.