Shares of Salix Pharmaceuticals (
SLXP) jumped 51% yesterday after the company announced positive results from two pivotal phase III trials of rifaximin for the treatment of non-constipation irritable bowel syndrome (IBS).
Two randomized, double-blind, placebo-controlled, multicenter trials, TARGET 1 and TARGET 2, were conducted to evaluate the efficacy and safety of rifaximin 550 mg. Patients treated with rifaximin saw statistically significant improvement in the primary endpoint compared with placebo. Rifaximin also achieved statistical significance in the key secondary endpoint of providing relief from IBS-related bloating.
Positive data from these studies is a major positive for the company. Rifaximin has become the company’s primary growth driver following the introduction of generic versions of Colazal in December 2007 by three players including Mylan Inc. (MYL).
Salix has been working on new indications of rifaximin, which should help in driving long-term growth. Rifaximin is currently marketed for the treatment of
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