Two drugstore chains are alleging in federal court that Wyeth Inc., owner of the patent on the antidepressant Effexor XR, conspired illegally with another drug maker to delay introduction of a generic substitute.

The plaintiffs, in Rite Aid Corp. v. Wyeth Inc., 12-cv-3523, filed Tuesday, allege that although Wyeth’s patent for Effexor XR ran out in June 2008, it kept Teva Pharmaceuticals USA’s lower-cost version off the market until July 2010.

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