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European regulators say that Teva Pharmaceuticals and its Cephalon unit breached antitrust rules by agreeing to delay a cheaper generic version of the Provigil sleep-disorder pill from reaching consumers.

The findings, which are preliminary, refer to the same so-called pay-to-delay arrangement that, two years ago, prompted Teva to pay $1.2 billion to the U.S. Federal Trade Commission to settle allegations that the companies violated antitrust law.

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