title: Effect of rifaximin on intestinal bacterial overgrowth in Crohn's disease as assessed by the H2-Glucose Breath Test.
abstract: The occurrence of intestinal bacterial overgrowth in patients with Crohn's Disease (CD) has been described and antimicrobial treatment has been shown to be effective in reversing this condition. However, the mechanisms underlying the efficacy of antimicrobial therapy are still only partially known. The aim of the present study was to evaluate the effect of a non-absorbable antibiotic (rifaximin) in comparison to placebo on bacterial overgrowth in patients with CD.
  
  
  METHODS
  Fourteen patients with inactive CD of the ileum and bacterial overgrowth, as assessed by the hydrogen breath test, were blindly allocated to receive rifaximin (1200 mg/day) or placebo t.i.d. for one week. A hydrogen breath test, and clinical and biochemical parameters were further performed 14 days and 30 days after starting treatment.
  
  
  RESULTS
  After 14 days, the hydrogen breath test proved to be negative in seven out of seven patients treated with rifaximin (p < 0.05), and in two out of seven in the placebo group (p = ns). After 30 days, the hydrogen breath test was positive in all patients of the rifaximin and placebo group, respectively. No changes in the CDAI score were documented in any patients.
  
  
  CONCLUSIONS
  Short-term administration of rifaximin is effective in the therapy of bacterial overgrowth in patients with inactive CD of the ileum, thus suggesting that the control of luminal bacterial growth could be useful in the management of these patients. However, since we observed a decline with time in this positive effect, further studies are needed to identify the most appropriate therapeutic strategies.
authors.affiliation: Istituto di Clinica Medica 2, Università La Sapienza, Rome, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Biancone
authors.forename: P
authors.initials: P
authors.lastname: Vernia
authors.forename: D
authors.initials: D
authors.lastname: Agostini
authors.forename: A
authors.initials: A
authors.lastname: Ferrieri
authors.forename: F
authors.initials: F
authors.lastname: Pallone
mesh_terms: D000328:Adult; D000890:Anti-Infective Agents / Q000494:pharmacology / Q000627:therapeutic use*; D001424:Bacterial Infections / Q000188:drug therapy*; D001944:Breath Tests; D003424:Crohn Disease / Q000188:drug therapy* / Q000382:microbiology*; D005260:Female; D005765:Gastrointestinal Agents / Q000494:pharmacology / Q000627:therapeutic use*; D006801:Humans; D006859:Hydrogen / Q000032:analysis; D007082:Ileum / Q000187:drug effects* / Q000382:microbiology; D008297:Male; D008875:Middle Aged; D010919:Placebos; D012294:Rifamycins / Q000494:pharmacology / Q000627:therapeutic use*; D000078262:Rifaximin; D016896:Treatment Outcome
chemical_list: D000890:Anti-Infective Agents; D005765:Gastrointestinal Agents; D010919:Placebos; D012294:Rifamycins; D006859:Hydrogen; D000078262:Rifaximin