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Showing 1–24 of 79 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: rifaximin Clear all
Completed Phase 2 Interventional

Dose-ranging Study of Rifaximin Soluble Solid Dispersion (SSD) Tablets for the Prevention of Complications of Early Decompensated Liver Cirrhosis

NCT01904409
View directory record Official record
Conditions
Liver Cirrhosis
Interventions
Placebo, Rifaximin SSD 40 mg IR tablet, Rifaximin SSD 80 mg IR tablet, Rifaximin SSD 40 mg SER tablet, Rifaximin SSD 80 mg SER tablet, Rifaximin SSD 80mgIR/80mgSER tablet
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
113
States / cities
Birmingham, Alabama • Dothan, Alabama • Mobile, Alabama + 94 more
Source: ClinicalTrials.gov public record
Updated Oct 22, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 3 Interventional Results available

Rifaximin 3 Times/Day (TID) for Non-Constipation Irritable Bowel Syndrome (IBS)

NCT00724126
View directory record Official record
Conditions
Non-Constipation Irritable Bowel Syndrome
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
637 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
88
States / cities
Anniston, Alabama • Birmingham, Alabama • Huntsville, Alabama + 83 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Recruiting Phase 1Phase 2 Interventional

Rifaximin SSD in Dementia Trial

NCT06718686
View directory record Official record
Conditions
Dementia Alzheimer Type, Dementia Associated With Cerebrovascular Disease
Interventions
Rifaximin SSD 40 mg IR tablet, Placebo
Drug
Lead sponsor
Jasmohan Bajaj
Federal
Eligibility
65 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 4, 2026, 1:04 PM EDT
Active, not recruiting Phase 3 Interventional

Evaluation of Rifaximin SSD for Delaying Encephalopathy Decompensation in Patients With Cirrhosis

NCT05297448
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin SSD, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years to 85 Years
Enrollment
466 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
90
States / cities
Homewood, Alabama • Chandler, Arizona • Sun City, Arizona + 70 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2025 · Synced Sep 4, 2026, 1:04 PM EDT
Withdrawn Phase 3 Interventional

A Randomized Comparison of Rifaximin Versus Lactulose in Hospitalized Cirrhotic Patients With Renal Failure

NCT02086825
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin, Lactulose
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 1, 2016 · Synced Sep 4, 2026, 1:04 PM EDT
Active, not recruiting Phase 3 Interventional

Study to Assess Rifaximin Soluble Solid Dispersion (SSD) for the Delay of Encephalopathy Decompensation in Cirrhosis

NCT05071716
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin SSD, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years to 85 Years
Enrollment
524 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
139
States / cities
Dothan, Alabama • Chandler, Arizona • Peoria, Arizona + 103 more
Source: ClinicalTrials.gov public record
Updated Jul 23, 2025 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 3 Interventional Results available

Weight Loss in Parkinson's Disease and Role of Small Bowel Bacterial Overgrowth

NCT01662791
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Rifaximin
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 3, 2016 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 3 Interventional Results available

Irritable Bowel Syndrome With Diarrhea (IBS-D) Rifaximin Re-Treatment Study

NCT01543178
View directory record Official record
Conditions
Irritable Bowel Syndrome With Diarrhea
Interventions
open-label rifaximin, double-blind placebo, double-blind rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
2,583 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
293
States / cities
Anniston, Alabama • Birmingham, Alabama • Dothan, Alabama + 226 more
Source: ClinicalTrials.gov public record
Updated Dec 11, 2017 · Synced Sep 4, 2026, 1:04 PM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Bacterial Overgrowth Associated With Chronic Multisymptom Illness Complex

NCT00956150
View directory record Official record
Conditions
Gulf War Syndrome
Interventions
Lactulose Breath Test, Rifaximin, Placebo
Procedure · Drug
Lead sponsor
Henry C. Lin, MD
Federal
Eligibility
21 Years and older
Enrollment
210 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2009
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Apr 30, 2013 · Synced Sep 4, 2026, 1:04 PM EDT
Not yet recruiting Phase 2 Interventional

Microbiota trAnSplant ThERaPy In hEpatiC Encephalopathy (MASTERPIECE)

NCT07528690
View directory record Official record
Conditions
Hepatic Encephalopathy, Cirrhosis
Interventions
Microbiota transplant therapy (MTT) capsules, Placebo capsule
Biological · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
21 Years and older
Enrollment
162 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
3
States / cities
West Haven, Connecticut • Dallas, Texas • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 3 Interventional Results available

Rifaximin 3 Times/Day (TID) for Non-Constipation Irritable Bowel Syndrome (IBS)

NCT00731679
View directory record Official record
Conditions
Non-Constipation Irritable Bowel Syndrome
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
623 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
86
States / cities
Hueytown, Alabama • Phoenix, Arizona • Sierra Vista, Arizona + 78 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Recruiting Phase 2 Interventional

Efficacy of Rifaximin With NAC in IBS-D

NCT06727422
View directory record Official record
Conditions
IBS (Irritable Bowel Syndrome), IBS-D (Diarrhea-predominant)
Interventions
rifaximin 66mg + N-acetylcysteine 560mg three times daily, RNIB21 containing rifaximin 132mg + N-acetylcysteine 560mg three times daily, Placebo
Drug
Lead sponsor
Mark Pimentel, MD
Other
Eligibility
18 Years and older
Enrollment
225 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 19, 2026 · Synced Sep 4, 2026, 1:04 PM EDT
Terminated Phase 3 Interventional Results available

One Year Study of Rifaximin Delayed Release (DR) Tablets in Crohn's Disease

NCT02240121
View directory record Official record
Conditions
Crohn's Disease
Interventions
Rifaximin EIR, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
72
States / cities
Scottsdale, Arizona • Tucson, Arizona • Little Rock, Arkansas + 65 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 1 Interventional

Rifaximin for Preventing Acute Graft Versus Host Disease (AGVHD)

NCT00967096
View directory record Official record
Conditions
Malignancy, Bone Marrow Transplantation
Interventions
Rifaximin
Drug
Lead sponsor
Emory University
Other
Eligibility
12 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 26, 2013 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Not applicable Interventional Results available

A Clinical Study to Limit Physiologic Intestinal FDG Uptake Uptake on PET-CT Scans

NCT01542541
View directory record Official record
Conditions
Intestinal FDG Uptake
Interventions
Rifaximin
Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 12, 2017 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 4 Interventional Results available

A Longitudinal Study to Identify IBS Phenotypes Using Fecal Microbiota and Hydrogen Breath Testing

NCT03219528
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Rifaximin 550 MG, Low FODMAP Diet
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 26, 2025 · Synced Sep 4, 2026, 1:04 PM EDT
Terminated Phase 2 Interventional Results available

Rifaximin on Visceral Hypersensitivity

NCT03462966
View directory record Official record
Conditions
Visceral Hypersensitivity, Irritable Bowel Syndrome
Interventions
Rifaximin
Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 12, 2022 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Prevention of Travelers' Diarrhea in Subjects Traveling Outside the U.S.

NCT00328380
View directory record Official record
Conditions
Diarrhea
Interventions
Rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
660 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2008
U.S. locations
3
States / cities
South Miami, Florida • Houston, Texas • La Porte, Texas
Source: ClinicalTrials.gov public record
Updated Nov 24, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Longitudinal Monitoring of Stool Characteristics

NCT05604274
View directory record Official record
Conditions
Cirrhosis, Liver
Interventions
App to monitor stool consistency and symptoms
Other
Lead sponsor
Hunter Holmes Mcguire Veteran Affairs Medical Center
Federal
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 12, 2025 · Synced Sep 4, 2026, 1:04 PM EDT
Not listed Phase 2 Interventional

Rifaximin to Modify the Disease Course in Sickle Cell Disease

NCT03719729
View directory record Official record
Conditions
Sickle Cell Disease, Antibiotics
Interventions
Rifaximin
Drug
Lead sponsor
New York Medical College
Other
Eligibility
18 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Valhalla, New York
Source: ClinicalTrials.gov public record
Updated Mar 13, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Completed Phase 2 Interventional Results available

MNK6106 for Liver Disease (Hepatic Cirrhosis) That in the Past Has Affected the Brain (Hepatic Encephalopathy)

NCT03712280
View directory record Official record
Conditions
Hepatic Cirrhosis, Hepatic Encephalopathy (HE)
Interventions
MNK6106, Rifaximin
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
4
States / cities
Coronado, California • Rialto, California • St. Petersburg, Florida + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 19, 2021 · Synced Sep 4, 2026, 1:04 PM EDT
Terminated Phase 1Phase 2 Interventional

Fecal Microbial Transplant in Pediatric Crohn's Disease

NCT02272868
View directory record Official record
Conditions
Crohn's Disease
Interventions
Fecal Microbial transplant, Normal Saline, rifaximin+omeprazole+miralax
Biological · Drug
Lead sponsor
Seattle Children's Hospital
Other
Eligibility
12 Years to 21 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 28, 2021 · Synced Sep 4, 2026, 1:04 PM EDT
Terminated Phase 3 Interventional Results available

One Year Study of Rifaximin Delayed Release (DR) in Crohn's Disease

NCT02240108
View directory record Official record
Conditions
Crohn's Disease
Interventions
Rifaximin EIR, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
78
States / cities
Huntsville, Alabama • Tucson, Arizona • Sherwood, Arkansas + 68 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2019 · Synced Sep 4, 2026, 1:04 PM EDT
Terminated Phase 2 Interventional Results available

Rifaximin for the Treatment of Gastrointestinal Toxicities Related to Pertuzumab-Based Therapy in Patients With Stage I-III HER2 Positive Breast Cancer

NCT04249622
View directory record Official record
Conditions
Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage IA Breast Cancer AJCC v8, Anatomic Stage IB Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage IIA Breast Cancer AJCC v8, Anatomic Stage IIB Breast Cancer AJCC v8, Anatomic Stage III Breast Cancer AJCC v8, Anatomic Stage IIIA Breast Cancer AJCC v8, Anatomic Stage IIIB Breast Cancer AJCC v8, Anatomic Stage IIIC Breast Cancer AJCC v8, HER2 Positive Breast Carcinoma, Prognostic Stage I Breast Cancer AJCC v8, Prognostic Stage IA Breast Cancer AJCC v8, Prognostic Stage IB Breast Cancer AJCC v8, Prognostic Stage II Breast Cancer AJCC v8, Prognostic Stage IIA Breast Cancer AJCC v8, Prognostic Stage IIB Breast Cancer AJCC v8, Prognostic Stage III Breast Cancer AJCC v8, Prognostic Stage IIIA Breast Cancer AJCC v8, Prognostic Stage IIIB Breast Cancer AJCC v8, Prognostic Stage IIIC Breast Cancer AJCC v8
Interventions
Best Practice, Questionnaire Administration, Rifaximin
Other · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Sep 15, 2025 · Synced Sep 4, 2026, 1:04 PM EDT