Barr Laboratories has submitted abbreviated new drug application for insomnia drug Ambien CR, generically Zolpidem Tartrate Extended-Release tablets with Para IV certification challenging Sanofi’s Orange Book listed patents. Subsequent to Barr Para IV move, Sanofi, on April 05 2007 filed a patent infringement lawsuit in the U.S. District Court of New Jersey to prevent Barr from proceeding with the commercialization of its generic Ambien. According to IMS sales data, Ambien CR had sales of approx. $ 659 million for the twelve months ended February 2007.
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