Rifaximin treatment for symptoms of irritable bowel syndrome.
OBJECTIVE
To evaluate the role of rifaximin in the treatment of symptoms associated with irritable bowel syndrome (IBS).


METHODS
Clinical literature was accessed through MEDLINE (1990-September 2007) using the terms rifaximin, small intestinal bacterial overgrowth (SIBO), bacterial overgrowth, and irritable bowel syndrome. Additionally, references in publications identified in the search were reviewed for relevant information.


METHODS
All articles published in English identified from the data source were evaluated. Randomized clinical trials in adult populations were included.


RESULTS
IBS is a common functional bowel disorder of unknown etiology. Some evidence suggests that symptoms are secondary to bacterial overgrowth in the small intestine. Rifaximin, a nonsystemic antibiotic that targets the gastrointestinal tract, has been evaluated in the treatment of SIBO. Six studies that evaluated rifaximin in either IBS, with or without documented SIBO, or SIBO alone, were reviewed. Significant symptom improvement was reported, and in some cases, correlated with reductions in hydrogen breath tests, suggesting successful treatment of bacterial overgrowth. Data are limited by controversial diagnostic techniques for SIBO, small sample sizes, the unpredictable course of the disorder, and variability in clinical trial methodology that prevents direct comparison.


CONCLUSIONS
Rifaximin offers a potential new therapeutic option for patients with refractory IBS. Larger, well-designed trials are necessary to elucidate the role of rifaximin in the treatment of this disorder.
Fumi
Andrea L
AL
Department of Pharmacy, Duke University Hospital, Durham, NC 27710, USA. andrea.fumi@duke.edu
Trexler
Katherine
K
D002986:Clinical Trials as Topic / Q000379:methods; D006801:Humans; D043183:Irritable Bowel Syndrome / Q000188:drug therapy* / Q000453:epidemiology / Q000503:physiopathology; D012294:Rifamycins / Q000627:therapeutic use*; D000078262:Rifaximin; D016896:Treatment Outcome
D012294:Rifamycins; D000078262:Rifaximin