The companies said the acquisition would diversify AbbVie's portfolio. However, Allergan also faces headwinds from generic competition. A bid to stop a challenge to the patents on its second top-selling drug failed earlier this year.
A federal court last year put the kibosh on a deal whereby Allergan transferred to the tribe the Restasis patents, which the tribe then licensed back to Allergan, asserting tribal sovereign immunity to have generic companies' challenge to the patents dismissed.
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