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What is Tadalafil?
http://www.article-book.com/articles/1489/1/What-is-Tadalafil/Page1.html
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By caqweyroopx caqweyrosjfMS
Published on 08/10/2009
 
Tadalafil is the active ingredient in Cialis, a medical treatment for erectile dysfunction. Cialis is a relatively new medicine use for impotence but works in a very similar way to the branded Viagra medicine which contains Sildenafil Citrate. Tadalafil works by inhibiting phosphodiesterase type 5 (just like Sildenafil does) which can degrade cGMP.