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2. 4 Common ED Pills: Weighing the Pros & Cons of Each - AOL

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

   Tadalafil is slightly more expensive than sildenafil on a per-tablet basis, though this may be less of a concern if you have intimacy more than one time per dose. gorodenkoff / iStock Vardenafil ...

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

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

   Cialis (tadalafil) has a half-life of 17.5 hours, ... They work to help widen the blood vessels in your privates, allowing more blood flow for stronger and longer-lasting arousal. Research shows ...

4. Cialis vs. Viagra: How Are They Different? - AOL

   www.aol.com/cialis-vs-viagra-different-175700354...

   Although Cialis and Viagra both make it easier to get and maintain an erection, there are a few key differences between these two ED medications that may make one a better choice than the other ...

5. Discovery and development of phosphodiesterase 5 inhibitors

   en.wikipedia.org/wiki/Discovery_and_development...

   This allows for a longer therapeutic window and is therefore often a more convenient drug than others with a shorter therapeutic window. Tadalafil is more bioavailable (80%) than sildenafil (40%) and vardenafil (15%) but it has a slow absorption, or about 2 hours compared to 50 minutes of sildenfil. Vardenafil is most known for its potency. [24]

6. Tadalafil: Your Ultimate Guide to Dosages, Side Effects & More

   www.aol.com/tadalafil-ultimate-guide-dosages...

   Getting a prescription for tadalafil (the active ingredient in brand names Adcirca and Cialis) can be a more complicated experience than many men expect. While Cialis and its generic tadalafil are ...

7. Tadalafil - Wikipedia

   en.wikipedia.org/wiki/Tadalafil

   Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil. [23] Some sildenafil users see a bluish tinge and have a heightened sensitivity to light because of PDE6 inhibition. [24] Sildenafil and vardenafil also inhibit PDE1 more than tadalafil. [23] PDE1 is found in the brain, heart, and vascular smooth muscle. [23]

8. 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] It is unclear if it is effective for treating sexual dysfunction in females. [8]

9. Cialis Side Effects: What to Expect (& How to Avoid Them) - AOL

   www.aol.com/cialis-side-effects-expect-avoid...

   Like other medications for the treatment of (ED), Cialis — and its generic version, tadalafil — can cause adverse effects at first. Fortunately, most tadalafil side effects are mild and ...