How to Test and Treat Small Intestinal Bacterial Overgrowth: an Evidence-Based Approach

Ali Rezaie, Mark Pimentel, Satish S. Rao

Research output: Contribution to journalReview articlepeer-review

114 Scopus citations


Small intestinal bacterial overgrowth (SIBO) is characterized by an excessive amount of bacteria in the small intestine and a constellation of symptoms that include bloating, pain, gas, and diarrhea. Although known for many decades, there is a lack of consensus and clarity regarding the natural history and methods for its diagnosis. Several tests have been proposed, including the glucose breath test, lactulose breath test, small intestinal aspiration and culture, and others. However, there is a lack of standardization of these tests and their interpretation. Treatment of SIBO remains empirical; generally, broad spectrum antibiotics are recommended for 2 weeks (amoxicillin, rifaximin, ciprofloxacin, etc.) but evidence for their use is fair. Clearly, there is a strong need to develop a systematic approach for the management of SIBO and to perform multicenter clinical trials for the treatment of SIBO. In this review, we will discuss the current evidence for the diagnosis and treatment of SIBO, which includes (1) elimination/modification of the underlying causes, (2) induction of remission (antibiotics and elemental diet), and (3) maintenance of remission (promotility drugs, dietary modifications, repeat or cyclical antibiotics).

Original languageEnglish (US)
Article number8
Pages (from-to)1-11
Number of pages11
JournalCurrent Gastroenterology Reports
Issue number2
StatePublished - Jan 1 2016


  • Antibiotics
  • Elemental diet
  • Glucose breath test
  • Lactulose breath test
  • Promotility drugs
  • Small intestinal aspiration and culture
  • Small intestinal bacterial overgrowth (SIBO)

ASJC Scopus subject areas

  • Gastroenterology


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