The U.S. Food and Drug Administration has canceled an advisory committee's meeting to review Merck & Co.'s sugammadex, further delaying the surgery drug.

Merck said the delay is due to the agency's wanting to conduct more site inspections related to a study. As of result, Merck does not expect to win approval before the drug's FDA decision deadline of April 22. Merck said it would continue to work with the FDA as it completes its review.

Sugammadex, designed to reverse the effects of muscle-relaxation agents used in surgery, is already available in more than 50 countries outside the U.S. and marketed as Bridion.

The committee meeting had been scheduled for March 18 and was intended to discuss the resubmission of a new drug application for sugammadex, which the Whitehouse Station, N.J., pharmaceutical company acquired as part of its 2009 takeover of Schering-Plough.

The FDA rejected Scherin-Plough's original application in 2008 citing concerns about possible allergic reactions and increased risks of bleeding when it was used with certain blood-thinning drugs. The agency later rejected Merck's application in 2013, citing operational concerns. Merck had said the FDA was assessing results of a clinical site inspection in connection to a hypersensitivity study.

--Peter Loftus contributed to this article.

Write to Maria Armental at maria.armental@wsj.com

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