Adjunctive antibiotic therapy with rifaximin may help reduce Crohn's disease activity

Dig Dis Sci. 2010 Apr;55(4):1079-84. doi: 10.1007/s10620-009-1111-y. Epub 2010 Jan 29.


Aims: Enteric bacteria are thought to contribute to the pathogenesis of Crohn's disease, and antibiotics may be an effective therapy. This study examines the efficacy of the nonsystemic (<0.4% absorbed) antibiotic rifaximin for inducing remission in patients with Crohn's disease.

Methods: Data from charts of patients with Crohn's disease who received rifaximin between 2001 and 2005 and had a Crohn's disease activity index score > or =220 at the time of rifaximin initiation were analyzed. The use of concomitant medications (e.g., steroids, anti-inflammatory agents) was allowed.

Results: In the 68 patient charts analyzed, the median duration of rifaximin treatment was 16.6 weeks, and the majority of patients (94%) received rifaximin 600 mg/day. Eighteen patients (26%) received rifaximin monotherapy, and 31 patients (46%) received concomitant steroids. The median baseline Crohn's disease activity index score at the time of rifaximin initiation was 265 (range, 220-460), and the mean duration of Crohn's disease was 17 years (range, 1-50 years). Crohn's disease remission occurred in 65% of patients. A 70% remission rate was achieved in patients who did not receive steroids, versus 58% in patients who received steroids. Clinical improvements continued 4 months after rifaximin initiation. Remission was achieved in 67% of patients who received rifaximin monotherapy.

Conclusions: Rifaximin therapy was associated with clinical improvement in patients with Crohn's disease and may be a useful treatment option to consider for inducing and maintaining remission.

MeSH terms

  • Adrenal Cortex Hormones / therapeutic use
  • Adult
  • Aged
  • Aged, 80 and over
  • Anti-Infective Agents / therapeutic use*
  • Crohn Disease / drug therapy*
  • Dose-Response Relationship, Drug
  • Drug Administration Schedule
  • Drug Therapy, Combination
  • Female
  • Humans
  • Male
  • Middle Aged
  • Remission Induction
  • Retrospective Studies
  • Rifamycins / therapeutic use*
  • Rifaximin
  • Secondary Prevention
  • Young Adult


  • Adrenal Cortex Hormones
  • Anti-Infective Agents
  • Rifamycins
  • Rifaximin