Endo Bid to Block Zydus’ Rival Copies of Pfizer’s Chantix Denied

A federal judge rejected Endo International PLC’s request for a temporary restraining order blocking sales of Zydus Lifesciences Inc.’s rival copy of Pfizer Inc.'s recalled Chantix, finding “no basis” to grant the motion in a lawsuit Endo’s Par unit filed the same day its patent was issued.

Par Pharmaceutical Inc. and Endo Par Innovation Co. sued Zydus on Wednesday in the US District Court for the District of Delaware over how it makes its generic version of the blockbuster smoking-cessation aid tablets. They alleged Zydus uses a process that infringes a patent issued earlier that day for a method to ...