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Nd medical personnel should be notified of any recent doses of tadalafil. edit Marketing In the United States, Eli Lilly has a multiyear agreement to promote tadalafil (Cialis) with professional golf's PGA TOUR. edit Trivia Some individuals with the surname of "Cialis" objected to the naming of Lilly's drug, but the pharmaceutical giant insists that the drug's name has nothing to do with the surname. 2 edit Cialis drug history This article or section does not cite its references or sources. Please help improve this article by introducing appropriate citations. (help, get involved!) This article has been tagged since October 2006. This article or section may require cleanup to meet Wikipedia's quality standards. Please help improve this article or replace this tag with a more specific message. This article has been tagged since October 2006. (help, talk) The history of Cialis cannot be discussed without mentioning Pfizer's drug, Viagra. The FDA's approval on March 27, 1998, led this prescription drug, Viagra, to a ground breaking success in just the first year of introduction as Pfizer sold drugs worth over a billion dollars. However, things changed considerably for the giant of erectile dysfunction drugs when the FDA also approved Levitra in August 19, 2003, and Cialis in November 21, 2003. In 1993 the drug company Icos began studying IC351, which is a PDE5 enzyme inhibitor, and this is basically the process through which the erectile dysfunction drugs work. In 1994, Pfizer scientists discovered that Sildenafil Citrate, which is a white crystalline powder that temporarily n
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