Generic drug maker Impax Laboratories Inc. is challenging patents around the heartburn drug Dexilant.
Those patents on the delayed-release 30-milligram and 60-milligram version of Dexilant are held by Takeda Pharmaceutical Co., which filed a patent infringement suit Friday against Hayward-based Impax (NASDAQ: IPXL) in U.S. District Court for the Northern District of California.
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