UPDATE 1-FDA seeks additional trial on AcelRx pain drug-device

March 9, 2015 2:18 PM

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March 9 (Reuters) - AcelRx Pharmaceuticals Inc said the U.S. Food and Drug Administration has sought an additional study on the company's pain drug-device rejected once last year.

Shares of AcelRx, which said it would not resubmit the Zalviso's regulatory application this quarter as it needed more clarity from the FDA, were down about 40 percent in premarket trading on Monday.

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