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Showing 1–24 of 44 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Rifaximin Placebo Clear all
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 20, 2026, 5:59 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 20, 2026, 5:59 PM EDT
Suspended Phase 1Phase 2 Interventional

Microbiota Intervention to Change the Response of Parkinson's Disease

NCT03575195
View directory record Official record
Conditions
Parkinson Disease
Interventions
Rifaximin, Placebo
Drug · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
30 Years and older
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 3, 2025 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Efficacy and Safety of Rifaximin With NAC in IBS-D

NCT04557215
View directory record Official record
Conditions
Irritable Bowel Syndrome With Diarrhea
Interventions
Rifaximin, N-acetylcysteine, Placebo
Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 27, 2023 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2 Interventional

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

NCT00269412
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
525 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
67
States / cities
Scottsdale, Arizona • Tempe, Arizona • Anaheim, California + 61 more
Source: ClinicalTrials.gov public record
Updated Nov 24, 2019 · Synced Sep 20, 2026, 5:59 PM EDT
Withdrawn Phase 2 Interventional

Rifaximin Treatment of Papulopustular Rosacea

NCT01359228
View directory record Official record
Conditions
Rosacea
Interventions
Rifaximin (XIFAXAN), Placebo
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 27, 2014 · Synced Sep 20, 2026, 5:59 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 20, 2026, 5:59 PM EDT
Completed Not applicable Interventional Results available

Rifaximin for the Treatment of Persistent Symptoms in Patients With Celiac Disease

NCT01137955
View directory record Official record
Conditions
Celiac Disease
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 28, 2022 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2 Interventional Results available

Blood Lipopolysaccharide (LPS) Rifaximin Study

NCT02124512
View directory record Official record
Conditions
Obese, Insulin Resistance, Metabolic Syndrome
Interventions
Rifaximin SSD, Placebo
Drug · Other
Lead sponsor
Philip Kern
Other
Eligibility
35 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 20, 2019 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2 Interventional Results available

Pharmacokinetics and Pharmacodynamics of Rifaximin Novel Formulations in Patients With Sickle Cell Disease

NCT05098028
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Low Dose Rifaximin ER, Low Dose Rifaximin DER, High Dose Rifaximin ER, High Dose Rifaximin DER, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
5
States / cities
Orange, California • Denver, Colorado • Atlanta, Georgia + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Not applicable Interventional Results available

Rifaximin in Minimal Hepatic Encephalopathy

NCT00533910
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin, placebo
Drug
Lead sponsor
Hunter Holmes Mcguire Veteran Affairs Medical Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Dec 16, 2020 · Synced Sep 20, 2026, 5:59 PM EDT
Not listed Phase 2 Interventional

Rifaximin to Prevent Recurrent HCV-Related Fibrosis After Liver Transplant

NCT01603108
View directory record Official record
Conditions
Hepatitis C
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 70 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 21, 2016 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2 Interventional Results available

Safety, Efficacy and Pharmacokinetics of Rifaximin in Patients With Moderate-to-severe Papulopustular Rosacea

NCT05150587
View directory record Official record
Conditions
Papulopustular Rosacea
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Alfasigma S.p.A.
Industry
Eligibility
18 Years and older
Enrollment
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
38
States / cities
Yuma, Arizona • Fort Smith, Arkansas • Long Beach, California + 31 more
Source: ClinicalTrials.gov public record
Updated Apr 23, 2024 · Synced Sep 20, 2026, 5:59 PM EDT
Not listed Phase 2 Interventional

The Role of Bacterial Overgrowth and Delayed Intestinal Transit in Hepatic Encephalopathy

NCT00281502
View directory record Official record
Conditions
Hepatic Encephalopathy, Hepatitis C, Liver Cirrhosis
Interventions
Rifaximin (drug)
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 75 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 4, 2010 · Synced Sep 20, 2026, 5:59 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 20, 2026, 5:59 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Treating Bacterial Overgrowth in Parkinson's Disease

NCT02470780
View directory record Official record
Conditions
Parkinson's Disease, Small Intestinal Bacterial Overgrowth
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
University of Cincinnati
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 29, 2024 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Rifaximin Soluble Solid Dispersion (SSD) Tablets Plus Lactulose for the Treatment of Overt Hepatic Encephalopathy (OHE)

NCT03515044
View directory record Official record
Conditions
Overt Hepatic Encephalopathy
Interventions
40 mg Rifaximin SSD once daily, 40 mg Rifaximin SSD twice daily, 80 mg Rifaximin SSD once daily, 80 mg Rifaximin SSD twice daily, Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
71 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
34
States / cities
Corona del Mar, California • Los Angeles, California • San Francisco, California + 21 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2023 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Efficacy of Rifaximin in Preventing Campylobacteriosis

NCT02280044
View directory record Official record
Conditions
Dysentery, Diarrhea, Enteric Campylobacteriosis
Interventions
Rifaximin intervention, Placebo intervention
Biological
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 19, 2018 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 3 Interventional Results available

Rifaximin and Placebo in the Treatment of Bowel Dysfunction After Anterior Resection for Rectal Cancer

NCT01345175
View directory record Official record
Conditions
Rectal Cancer
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
21 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2023
U.S. locations
3
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated May 13, 2024 · Synced Sep 20, 2026, 5:59 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 20, 2026, 5:59 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 20, 2026, 5:59 PM EDT
Terminated Not applicable Interventional

Pilot Study Of The Effect Of Rifaximin On B-Cell Dysregulation In Cirrhosis

NCT01951209
View directory record Official record
Conditions
Liver Cirrhosis, Chronic Hepatitis C
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
David E. Kaplan, MD MSc
Federal
Eligibility
18 Years to 70 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 10, 2021 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Not applicable Interventional Results available

Neomycin and Rifaximin Plus Neomycin in Treating Methane Positive Constipation Predominant Irritable Bowel Syndrome

NCT00945334
View directory record Official record
Conditions
Constipation-predominant Irritable Bowel Syndrome
Interventions
Neomycin, Placebo, Rifaximin
Drug
Lead sponsor
Mark Pimentel, MD
Other
Eligibility
18 Years to 75 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
2
States / cities
Los Angeles, California • Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 9, 2015 · Synced Sep 20, 2026, 5:59 PM EDT
Completed Phase 4 Interventional Results available

Rifaximin Therapy in Chronic Kidney Disease

NCT02342639
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Jason Stubbs, MD
Other
Eligibility
18 Years and older
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 20, 2026, 5:59 PM EDT