Regeneron Pharmaceuticals Inc. said initial data from an ongoing study of the company’s experimental antibody cocktail for use in hospitalized Covid-19 patients requiring low-flow oxygen show the therapy was sufficiently effective to warrant continuing the trial.

U.S. hospitals have been slow to embrace Covid-19 antibody drugs from Eli Lilly and Co. and Regeneron Pharmaceuticals Inc. that were authorized to reduce the risk of hospitalization, U.S. officials said.

The U.S. government will start distributing Regeneron Pharmaceuticals Inc.’s newly authorized Covid-19 antibody combination on Nov. 24, beginning with more than 30,000 treatment courses, a health official said.