Shares of Zogenix (ZGNX -12.9%) tumble today on more than a 2x surge in volume in response to the competitive threat from Purdue. The FDA granted its tamper-resistant hydrocodone product Priority Review which means that it could debut in the U.S. by the end of 2014.
Zogenix is working on its own abuse deterrent version of Zohydro. It plans to submit an sNDA in October. The time frame for regulatory review may delay its U.S. launch until the mid-2015, however.