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FDA reviewers question proposed study design for Salix's Xifaxan in IBS

This article was originally published in Scrip

Executive Summary

Shares of Salix Pharmaceuticals tumbled as low as 11.3% on 14 November, or $4.24, after US drug reviewers questioned whether a new trial design for the firm's antibiotic Xifaxan (rifaximin) would gauge whether the drug is effective and safe in treating patients with irritable bowel syndrome with diarrhea (IBS-D).



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