New molecular entity: Rifaximin

This nonsystemic, gastrointestinal-selective oral antibiotic exerts its effect by binding to the beta-subunit of bacterial DNA- dependent RNA polymerase. Rifaximin was approved on May 25, 2004, for the treatment of travelers’ diarrhea caused by noninvasive strains of Escherichia coli in patients aged 12 years and older.

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