FDA approves rifamycin for treatment of traveler’s diarrhea


The Food and Drug Administration has approved rifamycin (Aemcolo) for the treatment of traveler’s diarrhea caused by noninvasive strains of Escherichia coli.

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FDA approval was based on results of three clinical trials. The efficacy of rifamycin was shown in a trial of 264 adults with traveler’s diarrhea in Guatemala and Mexico. Compared with placebo, rifamycin significantly reduced symptoms of the condition. The safety of rifamycin was illustrated in a pair of studies including 619 adults with traveler’s diarrhea who took rifamycin orally for 3-4 days. The most common adverse events were headache and constipation.

Traveler’s diarrhea is the most common travel-related illness, affecting 10%-40% of travelers. It can be caused by a multitude of pathogens, but bacteria from food or water is the most common source. High-risk areas include much of Asia, the Middle East, Mexico, Central and South America, and Africa.

Rifamycin was not effective in patients with diarrhea complicated by fever and/or bloody stool or in diarrhea caused by a pathogen other than E. coli.

“Travelers’ diarrhea affects millions of people each year, and having treatment options for this condition can help reduce symptoms of the condition,” Edward Cox, MD, MPH, director of the Office of Antimicrobial Products in the FDA’s Center for Drug Evaluation and Research, said in the press release.

Find the full press release on the FDA website.

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