Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Sep 24, 2026, 12:45 AM EDT

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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Conditions
Small Intestinal Bacterial Overgrowth Syndrome (SIBO), Small Intestinal Bacterial Overgrowth
Interventions
AV1PD1A
Dietary Supplement
Lead sponsor
National University of Natural Medicine
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Portland, Oregon
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Transit Time and Bacterial Overgrowth Using SmartPill Capsule

NCT00577772
Conditions
Small Bowel Bacterial Overgrowth, Gastrointestinal Diseases, Stomach Diseases, Digestive System Diseases
Interventions
Xifaxan, SmartPill, Lactulose hydrogen breath test (H_2BT)
Drug · Device · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
Scottsdale, Arizona
Completed Not applicable Interventional Results available

Gulf War Digestive Health Study

NCT00680836
Conditions
Irritable Bowel Syndrome, Small Intestinal Bacterial Overgrowth
Interventions
Placebo, Rifaximin
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
35 Years to 72 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2013
U.S. locations
1
States / cities
Salt Lake City, Utah
Completed No phase listed Observational

Clinical Utility of Breath Tests in GI

NCT03261856
Conditions
Small Intestinal Bacterial Overgrowth, Lactose Intolerance, Fructose Intolerance, Glucose Intolerance
Interventions
Not listed
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
1,080 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Augusta, Georgia
Conditions
Resistance Bacterial
Interventions
T2Resistance Panel
Diagnostic Test
Lead sponsor
T2 Biosystems
Industry
Eligibility
18 Years and older
Enrollment
1,566 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
10
States / cities
Birmingham, Alabama • San Francisco, California • Tampa, Florida + 7 more
Completed Not applicable Interventional Accepts healthy volunteers Results available

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

NCT00619970
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
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
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Xylitol for Chronic Sinusitis

NCT03229551
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
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
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
Conditions
Diarrhea Predominant Irritable Bowel Syndrome, Small Intestinal Bacterial Overgrowth
Interventions
Serum-derived bovine immunoglobulin protein isolate (SBI), Placebo
Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Los Angeles, California
Recruiting No phase listed Observational Accepts healthy volunteers

Urine Metabolites in the Diagnosis of Disease

NCT06710067
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
Conditions
SIBO, Small Bowel Bacterial Overgrowth Syndrome
Interventions
Hydrogen content recording
Device
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Baltimore, Maryland
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
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
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
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
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
Completed Phase 2Phase 3 Interventional Results available

Treating Bacterial Overgrowth in Parkinson's Disease

NCT02470780
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
Conditions
Chronic Idiopathic Constipation
Interventions
Lubiprostone
Drug
Lead sponsor
Texas Tech University Health Sciences Center, El Paso
Other
Eligibility
18 Years to 65 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
El Paso, Texas
Conditions
Small Intestinal Bacterial Overgrowth, Irritable Bowel Syndrome, Functional Dyspepsia, Functional Abdominal Pain
Interventions
Not listed
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
4 Years to 17 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Houston, Texas
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Azithromycin for Child Survival in Niger: Programmatic Trial (AVENIR)

NCT05288023
Conditions
Resistance Bacterial, Morality, Child Health, Implementation
Interventions
Azithromycin for Oral Suspension
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
1 Month and older
Enrollment
169,707 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
San Francisco, California
Conditions
HIV, Non-HIV, Vagus Nerve Dysfunction
Interventions
Pyridostigmine, Placebos, non-invasive vagal nerve stimulation
Drug · Procedure
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
215 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
New York, New York
Completed Not applicable Interventional Accepts healthy volunteers

Does Small Intestinal Bacterial Overgrowth Contribute to Functional Dyspepsia

NCT00956397
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