Pernix Therapeutics Holdings Inc. shares surged 42% in morning trade Thursday after the company said a district judge had ruled in its favor in a patent infringement case against Actavis Laboratories, which is part of Allergan PLC . The judge said Actavis could not make or sell a generic of Pernix's Zohydro ER, an opioid pain medication, until two patents expire in 2019 and 2034. Pernix Therapeutics shares have risen 17.2% over the last three months, compared with a 7.4% rise in the S&P 500 .
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