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UPDATE: Salix Sees Regulatory Delay In Widening Use Of Xifaxan
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By Peter Loftus
Of DOW JONES NEWSWIRES
Salix Pharmaceuticals Inc. (SLXP) expects the U.S. Food and Drug Administration to decline to approve the company's bid to widen the uses for its gastrointestinal antibiotic Xifaxan because the regulator wants more information.
Shares of Salix plunged $9.40, or 23%, to $32.05 Thursday, as investors reduced expectations of near-term sales growth in light of the regulatory setback.
Xifaxan is currently approved to treat travelers' diarrhea and to reduce the risk of recurrence of hepatic encephalopathy. The drug had $167.4 million in sales for the first nine months of 2010, or 76% of total company sales; full-year 2010 figures haven't been reported yet.
Last year, the company applied for FDA approval to market the drug to treat non-constipation irritable bowel syndrome and IBS-related bloating. The company had hoped for FDA approval by a target date of March 7, and analysts were expecting the approval to help lift Xifaxan sales.
A company-funded clinical trial showed that the drug provided significant relief of IBS symptoms versus a placebo, according to results published in The New England Journal of Medicine last month.
But Salix said Thursday that based on a telephone conversation with FDA officials Wednesday evening, the company now expects the agency to send a so-called "complete response letter" by March 7. The agency sends such letters when it's not ready to approve drug applications.
Salix said the FDA wants additional information regarding "retreatment." Salix spokesman Michael Freeman said IBS is a chronic condition, and the FDA wants to know how Xifaxan would perform in patients who experience a recurrence of symptoms. Certain clinical data supporting Salix's IBS application only tracked patients for 10 weeks following a 2-week treatment regimen of Xifaxan.
"It seems now FDA has taken a conservative stance with the application," BMO Capital Markets analyst Robert Hazlett wrote in a research note to clients.
Analysts said it's now possible the FDA would delay final approval of the application for as much as two to three years. The company may have to run an additional clinical trial to generate the retreatment data.
Freeman said it was too soon to say whether the company will run an additional trial. Salix, of Raleigh, N.C., said it will consider its next steps following receipt of the FDA's complete response letter.
Freeman said the company's business remained strong despite the setback, and that it's annualized run rate of revenue for currently marketed products is about $476 million. The company also predicts peak annual sales of $1.2 billion for its current products, reflecting uses already approved by the FDA.
-By Peter Loftus, Dow Jones Newswires; +1-215-656-8289