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US appeals court affirms invalidity of Ultram ER patent

This article was originally published in Scrip

Executive Summary

A US federal appeals court has affirmed the invalidity of the two patents held by Purdue Pharma relating to once-daily Ultram ER (extended-release tramadol), in a boost for Par Pharmaceutical, which has been marketing a generic tablet version in the 100mg and 200mg strengths since last year.

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