Until its patent expired in 2008, it was ranked 20th among the 100 best selling drugs in the world.
VOA: standard.2010.03.14
By the end of the year, the patents will have expired on 16 drugs--including allergy pill Allegra and cholesterol pill Pravachol, which have already expired, and Flonase and Biaxin, which could face generic competition by the fall.