Teva's Copaxone has generics free rein

Teva has lost its appeal to maintain several patents on its 40 mg version of its multiple sclerosis drug Copaxone.

The drug is a key sales contributor for Teva. Sales of the short-acting version of the drug have plummeted with Mylan and Novartis generics out there. Sales for the 20mg and 40mg versions together amounted to $940 million in North America, this is down more than $700 million from last year's $1.65 billion.

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