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Study to Assess the Efficacy and Safety of Rifaximin Administered BID in the Treatment of Patients With Diarrhea-Associated Irritable Bowel Syndrome

This study has been completed.
Information provided by:
Valeant Pharmaceuticals International, Inc. Identifier:
First received: December 22, 2005
Last updated: December 21, 2009
Last verified: December 2009
This is placebo-controlled study of three rifaximin doses in patients with DIBS. Subjects will be randomized to receive daily doses of placebo BID, rifaximin 275 mg BID, rifaximin 550 mg BID, or 1100 mg BID for 14 days. These four groups will subsequently receive an additional two weeks of placebo for a total of 4 weeks of treatment. A fifth group of subjects will receive rifaximin 550 mg BID for a period of 28 days. Subjects who successfully respond to treatment at the end of the 28-day Treatment Phase will be followed in a Post-treatment Phase that includes study visits during Weeks 6, 8, 12 and 16. Subjects who relapse during the Post-treatment Phase will be discontinued from the study.

Condition Intervention Phase
Irritable Bowel Syndrome
Drug: Rifaximin
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double-Blind
Primary Purpose: Treatment
Official Title: Multicenter, Randomized, Double-Blind, Placebo-Controlled Study to Assess The Efficacy and Safety of Three Different Doses (275, 550 AND 1100 MG) of Rifaximin Administered BID For Either Two or Four Weeks in The Treatment of Patients With Diarrhea-Associated Irritable Bowel Syndrome

Resource links provided by NLM:

Further study details as provided by Valeant Pharmaceuticals International, Inc.:

Primary Outcome Measures:
  • The primary objective of this trial is to evaluate the efficacy of a 14-day course of oral rifaximin at 550 mg BID versus placebo in providing adequate relief from Diarrhea-associated IBS (DIBS) symptoms.

Secondary Outcome Measures:
  • To evaluate the dose-response relationship of placebo administered for 28 days and rifaximin administered at 275 mg BID, 550 mg BID, or 1100 mg BID for 14 days;
  • to evaluate the efficacy of 550 mg BID for 4 weeks to determine if there are any differences when treatment is extended for an additional 2-week period when compared to a similar dosing regimen for 2 weeks;
  • to evaluate the durability of response over a 12-week Post-treatment Phase in subjects with DIBS who achieved a response during the acute Treatment Phase of the study.

Estimated Enrollment: 525
Study Start Date: December 2005
Study Completion Date: September 2008
Primary Completion Date: August 2007 (Final data collection date for primary outcome measure)
Detailed Description:
While IBS is one of the most common chronic medical conditions the etiology of IBS is unknown. Although not a life-threatening illness, IBS is considered to be a serious condition that has a substantial impact on a subject's day-to-day function. IBS is characterized by abdominal pain and altered bowel habits, including diarrhea, constipation, or alternating diarrhea and constipation. Symptoms are typically intermittent but may be continuous.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Male or female subject 18 years of age or older.
  2. Irritable bowel syndrome confirmed by the Rome II Criteria
  3. Lower endoscopic examination that demonstrates normal colonic anatomy

Exclusion Criteria:

  1. Subject has exclusively constipation-predominant IBS (CIBS) that is characterized by < 3 bowel movements/week or hard and lumpy stools.
  2. Subject has alternating IBS, but is currently presenting with constipation associated IBS symptoms.
  3. Subject has had adequate control of their DIBS and their symptom of bloating the week preceding the screening visit or at the time of randomization. Bloating includes the following symptoms: abdominal fullness, bloating, gas, or swelling.
  4. Subjects has a positive stool culture for O & P (ovum and parasite) and/or Clostridium difficile
  5. Subject has failed to record 2 negative weekly global assessments during the past 10 days prior to randomization.
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Please refer to this study by its identifier: NCT00269412

  Show 67 Study Locations
Sponsors and Collaborators
Valeant Pharmaceuticals International, Inc.
  More Information

Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00269412     History of Changes
Other Study ID Numbers: RFIB2001
Study First Received: December 22, 2005
Last Updated: December 21, 2009

Keywords provided by Valeant Pharmaceuticals International, Inc.:
Irritable bowel syndrome

Additional relevant MeSH terms:
Irritable Bowel Syndrome
Pathologic Processes
Signs and Symptoms, Digestive
Signs and Symptoms
Colonic Diseases, Functional
Colonic Diseases
Intestinal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Anti-Infective Agents
Gastrointestinal Agents
Nucleic Acid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Anti-Bacterial Agents processed this record on April 28, 2017