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ClinicalTrials.gov public records Last synced Oct 21, 2026, 10:54 PM EDT

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Showing 1–24 of 48 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Bacterial Overgrowth Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Pre-, Pro- & Anti-biotics on Gut Microbiota

NCT01414010
View directory record Official record
Conditions
Human Gut Microbiota
Interventions
Trametes versicolor extract, Saccharomyces boulardii, Amoxicillin
Dietary Supplement · Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 39 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 24, 2017 · Synced Oct 21, 2026, 10:54 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 4, 2016 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Phase 2 Interventional

Aerosolized Antibiotics and Respiratory Tract Infection in Patients on Mechanical Ventilation

NCT00396578
View directory record Official record
Conditions
Ventilator Associated Pneumonia, Respiratory Infection, Tracheobronchitis
Interventions
aerosolized vancomycin or gentamicin
Drug
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2004
U.S. locations
1
States / cities
Stony Brook, New York
Source: ClinicalTrials.gov public record
Updated Nov 7, 2006 · Synced Oct 21, 2026, 10:54 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 27, 2025 · Synced Oct 21, 2026, 10:54 PM EDT
Recruiting Phase 1Phase 2 Interventional

Herbal Evaluation Of Artemisia Annua For Small Intestinal Bacterial Overgrowth

NCT06721884
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth Syndrome (SIBO)
Interventions
Artemisia Annua Leaf, placebo
Dietary Supplement · Other
Lead sponsor
National University of Natural Medicine
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced Oct 21, 2026, 10:54 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Urine Metabolites in the Diagnosis of Disease

NCT06710067
View directory record Official record
Conditions
Colorectal Cancer, Small Intestinal Bacterial Overgrowth Syndrome (SIBO), Crohn Disease, Celiac Disease
Interventions
Not listed
Lead sponsor
Luventix, Inc.
Industry
Eligibility
18 Years and older
Enrollment
1,250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
4
States / cities
Encinitas, California • Santa Monica, California • Walnut Creek, California
Source: ClinicalTrials.gov public record
Updated Dec 13, 2024 · Synced Oct 21, 2026, 10:54 PM 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 21, 2026, 10:54 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Xylitol for Chronic Sinusitis

NCT03229551
View directory record Official record
Conditions
Chronic Rhinosinusitis, Rhinosinusitis, Sinusitis, Drain Sinus, Endoscopic Sinus Surgery, Biofilms, Bacterial Overgrowth
Interventions
Xylitol, Saline
Drug
Lead sponsor
Ochsner Health System
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Apr 7, 2023 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Phase 4 Interventional Results available

Effects of Lubiprostone on Small Bowel and Colonic Bacteria: A Correlation Study With Segmental and Whole Gut Transit

NCT00844831
View directory record Official record
Conditions
Constipation
Interventions
Lubiprostone
Drug
Lead sponsor
University of Louisville
Other
Eligibility
18 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 27, 2017 · Synced Oct 21, 2026, 10:54 PM EDT
Recruiting No phase listed Observational

Indiana University Gastrointestinal Motility Diagnosis Registry

NCT04506593
View directory record Official record
Conditions
Eosinophilic Esophagitis, Gastroesophageal Reflux Disease (GERD), Gastroparesis, Functional Vomiting, Irritable Bowel Syndrome (IBS), Constipation, Chronic Intestinal Pseudo-obstruction, Fecal Incontinence, Small Intestinal Bacterial Overgrowth
Interventions
no intervention
Other
Lead sponsor
Indiana University
Other
Eligibility
Not listed
Enrollment
5,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Oct 21, 2026, 10:54 PM EDT
Withdrawn Early Phase 1 Interventional

Novel Supplement-based Therapy for the Treatment of Small Intestinal Bacterial Overgrowth

NCT03420976
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth
Interventions
Novel Supplement Based Therapy
Dietary Supplement
Lead sponsor
Atrium Innovations
Industry
Eligibility
19 Years to 84 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Oxford, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 12, 2021 · Synced Oct 21, 2026, 10:54 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 May 1, 2013 · Synced Oct 21, 2026, 10:54 PM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Efficacy of AEMCOLO (Rifamycin SV MMX) in the Treatment of Small Intestinal Bacterial Overgrowth (SIBO)

NCT04501380
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth, Gastrointestinal Disease, Gastrointestinal Infection
Interventions
AEMCOLO (Rifamycin SV MMX)
Drug
Lead sponsor
Bradley Connor
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 5, 2022 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Early Phase 1 Interventional

Reduction of Bacterial Resistance With Inhaled Antibiotics in the Intensive Care Unit

NCT01878643
View directory record Official record
Conditions
Respiratory Infection, Bacterial Resistance, Respiratory Failure
Interventions
vancomycin or gentamicin, Placebo
Drug
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2002
U.S. locations
1
States / cities
Stony Brook, New York
Source: ClinicalTrials.gov public record
Updated Jun 17, 2013 · Synced Oct 21, 2026, 10:54 PM EDT
Not listed Not applicable Interventional

A Research Study to Evaluate the Effects of Repeated Intravitreal Injections on Bacteria Around the Eye

NCT01531842
View directory record Official record
Conditions
Central Retinal Vein Occlusion, Choroidal Neovascularization, Age-related Macular Degeneration, Branch Retinal Vein Occlusion
Interventions
Conj flora Antibiotic resistance
Procedure
Lead sponsor
Mid Atlantic Retina
Other
Eligibility
Not listed
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 13, 2012 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Does Small Intestinal Bacterial Overgrowth Contribute to Functional Dyspepsia

NCT00956397
View directory record Official record
Conditions
Functional Dyspepsia, Small Intestinal Bacterial Overgrowth, Chronic Abdominal Discomfort
Interventions
Rifaximin, Lactulose Breath Test, Placebo
Drug · Procedure
Lead sponsor
Henry C. Lin, MD
Federal
Eligibility
21 Years and older
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2007
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Oct 24, 2012 · Synced Oct 21, 2026, 10:54 PM 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 21, 2026, 10:54 PM EDT
Not listed Not applicable Interventional

The Small Intestine Bacterial Overgrowth Study Pilot

NCT03588845
View directory record Official record
Conditions
Systemic Sclerosis, Small Intestinal Bacterial Overgrowth
Interventions
Treatment Protocol, Standard of Care
Other
Lead sponsor
Canadian Scleroderma Research Group
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 17, 2019 · Synced Oct 21, 2026, 10:54 PM EDT
Recruiting Not applicable Interventional

A Study of Breath Testing for Small Intestinal Bacterial Overgrowth

NCT05976165
View directory record Official record
Conditions
Gastroesophageal Reflux, Regurgitation, Heartburn
Interventions
Breath Testing
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 21, 2026, 10:54 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 5, 2010 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Is Chronic Abdominal Pain in Pediatric Patients Due to Small Intestinal Bacterial Overgrowth?

NCT00619970
View directory record Official record
Conditions
Chronic Abdominal Pain, Small Intestinal Bacterial Overgrowth
Interventions
Lactulose Breath Test, xifaxan, placebo
Procedure · Drug
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
8 Years to 18 Years
Enrollment
115 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 16, 2017 · Synced Oct 21, 2026, 10:54 PM EDT
Active, not recruiting Phase 2 Interventional

A Study of the Safety and Tolerability in Participants With PIK3CA-related Overgrowth Spectrum or Proteus Syndrome Who Are Being Treated With Miransertib (MK-7075) in Other Studies (MK-7075-006)

NCT04980872
View directory record Official record
Conditions
PIK3CA-Related Overgrowth Spectrum (PROS)/Proteus Syndrome (PS)
Interventions
Miransertib
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
2 Years to 120 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2030
U.S. locations
5
States / cities
Atlanta, Georgia • Boston, Massachusetts • Cincinnati, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated Feb 7, 2025 · Synced Oct 21, 2026, 10:54 PM EDT
Completed Not applicable Interventional Results available

Bacterial Resistance in Patients Receiving Post-Intravitreal Injection Antibiotics

NCT02223338
View directory record Official record
Conditions
Bacterial Resistance
Interventions
Ciprofloxacin, Standard Aseptic Technique
Drug
Lead sponsor
Loma Linda University
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Nov 7, 2017 · Synced Oct 21, 2026, 10:54 PM EDT
Completed No phase listed Observational

Retrospective Analysis of Treatment Outcomes in Patients With Bacterial Overgrowth Syndrome Diagnosed by D-Xylose Breath Testing

NCT01324895
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth Syndrome (SIBO), Small Bowel Bacterial Overgrowth Syndrome (SBBOS)
Interventions
Not listed
Lead sponsor
University of Florida
Other
Eligibility
Not listed
Enrollment
944 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 26, 2012 · Synced Oct 21, 2026, 10:54 PM EDT