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ClinicalTrials.gov public records Last synced Oct 9, 2026, 9:24 AM EDT

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Showing 49–72 of 79 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Rifaximin (Xifaxan) Clear all
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 10, 2025 · Synced Oct 9, 2026, 9:24 AM EDT
Recruiting Phase 1 Interventional

Evaluating the Effect Of Rifaximin on the Gut Microbiota and Metabolome in SIBO Using CapScan®

NCT06298409
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth
Interventions
CapScan collection capsule
Device
Lead sponsor
Envivo Bio Inc
Industry
Eligibility
18 Years to 80 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Mountain View, California
Source: ClinicalTrials.gov public record
Updated Jun 11, 2025 · Synced Oct 9, 2026, 9:24 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Steady-State Pharmacokinetics of Rifaximin 550 mg Tablets in Healthy and Hepatically Impaired Subjects

NCT03818672
View directory record Official record
Conditions
Severe Hepatic Impairment
Interventions
Rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Nov 30, 2023 · Synced Oct 9, 2026, 9:24 AM EDT
Completed Phase 1 Interventional

A Pilot Study of Xifaxan to Treat Patients With PSC

NCT01695174
View directory record Official record
Conditions
Primary Sclerosing Cholangitis (PSC)
Interventions
Xifaxan
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 15, 2014 · Synced Oct 9, 2026, 9:24 AM 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 4, 2025 · Synced Oct 9, 2026, 9:24 AM EDT
Withdrawn Early Phase 1 Interventional

Impact of Rifaximin Therapy on Intestinal Byproducts in End-Stage Renal Disease

NCT02738905
View directory record Official record
Conditions
End Stage Renal Disease
Interventions
Rifaximin
Drug
Lead sponsor
Jason Stubbs, MD
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
2
States / cities
Kansas City, Kansas • Westwood, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 28, 2019 · Synced Oct 9, 2026, 9:24 AM 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 29, 2019 · Synced Oct 9, 2026, 9:24 AM EDT
Terminated Phase 4 Interventional Results available

Efficacy, Safety, And Pharmacokinetics Of Rifaximin In Subjects With Severe Hepatic Impairment And Hepatic Encephalopathy

NCT01846663
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Placebo, Rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
28
States / cities
Birmingham, Alabama • Phoenix, Arizona • Tucson, Arizona + 22 more
Source: ClinicalTrials.gov public record
Updated Jan 9, 2024 · Synced Oct 9, 2026, 9:24 AM EDT
Terminated Not applicable Interventional

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

NCT01846806
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 4, 2017 · Synced Oct 9, 2026, 9:24 AM EDT
Completed Phase 3 Interventional Results available

A Trial to Compare Xifaxan to Vancomycin for the Treatment of Clostridium Difficile-Associated Diarrhea (CDAD)

NCT00269399
View directory record Official record
Conditions
Clostridium Infections, Diarrhea
Interventions
Rifaximin (Xifaxan), Vancomycin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
237 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
63
States / cities
Scottsdale, Arizona • Redlands, California • Longmont, Colorado + 54 more
Source: ClinicalTrials.gov public record
Updated Oct 14, 2019 · Synced Oct 9, 2026, 9:24 AM 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 22, 2016 · Synced Oct 9, 2026, 9:24 AM EDT
Completed Phase 1 Interventional

Rifaximin in Patients With Monoclonal Gammopathy

NCT03820817
View directory record Official record
Conditions
IgA Monoclonal Gammopathy, IgG Monoclonal Gammopathy, IgM Monoclonal Gammopathy, Light Chain Deposition Disease, Monoclonal Gammopathy, Smoldering Waldenstrom Macroglobulinemia, Waldenstrom Macroglobulinemia, Gammopathy, Monoclonal, Gammopathy Igg
Interventions
Rifaximin
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated May 26, 2026 · Synced Oct 9, 2026, 9:24 AM 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 5, 2021 · Synced Oct 9, 2026, 9:24 AM 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 10, 2019 · Synced Oct 9, 2026, 9:24 AM 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 21, 2019 · Synced Oct 9, 2026, 9:24 AM 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 20, 2018 · Synced Oct 9, 2026, 9:24 AM EDT
Not listed Phase 4 Interventional

Weight Loss Benefits of Rifaximin in an Intermittent Fasting Diet

NCT04674176
View directory record Official record
Conditions
Weight Loss
Interventions
Rifaximin
Drug
Lead sponsor
Bayhealth Medical Center
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Dover, Delaware
Source: ClinicalTrials.gov public record
Updated Dec 19, 2020 · Synced Oct 9, 2026, 9:24 AM 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 14, 2019 · Synced Oct 9, 2026, 9:24 AM 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 20, 2026 · Synced Oct 9, 2026, 9:24 AM EDT
Completed Phase 3 Interventional Results available

Safety and Tolerability Study of Rifaximin in Participants With a History of Hepatic Encephalopathy

NCT00686920
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
Rifaximin
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years and older
Enrollment
322 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
31
States / cities
Birmingham, Alabama • Aurora, California • Fresno, California + 28 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2019 · Synced Oct 9, 2026, 9:24 AM 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 14, 2026 · Synced Oct 9, 2026, 9:24 AM 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 27, 2013 · Synced Oct 9, 2026, 9:24 AM 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 10, 2019 · Synced Oct 9, 2026, 9:24 AM 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 11, 2021 · Synced Oct 9, 2026, 9:24 AM EDT