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ClinicalTrials.gov public records Last synced Oct 1, 2026, 7:43 AM EDT

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Showing 1–24 of 206 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Proton pump inhibitor (PPI) Clear all
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effects of Gastric Acid on Colonic Microbiome

NCT01901276
View directory record Official record
Conditions
Clostridium Difficile
Interventions
Omeprazole 40 mg bid
Drug
Lead sponsor
Daniel Freedberg, MD
Other
Eligibility
18 Years and older · Male only
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 15, 2024 · Synced Oct 1, 2026, 7:43 AM EDT
Completed No phase listed Observational

Proton Pump Inhibitor (PPI) Therapy for Newly Diagnosed Esophagitis

NCT00586963
View directory record Official record
Conditions
Erosive Esophagitis, Reflux Esophagitis, GERD
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 23, 2010 · Synced Oct 1, 2026, 7:43 AM EDT
Not yet recruiting Phase 4 Interventional

Efficacy of Potassium-Competitive Acid Blockers in Barrett's Esophagus (PCAB BE Study)

NCT07788742
View directory record Official record
Conditions
Barrett Esophagus
Interventions
Potassium-Competitive Acid Blockers (PCABs)
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of Acalabrutinib Suspension to Evaluate Relative Bioavailability and Proton-pump Inhibitor Effect in Healthy Volunteers

NCT04435483
View directory record Official record
Conditions
Pharmacokinetics, Bioavailability
Interventions
Acalabrutinib Treatment A, Acalabrutinib Treatment B, Acalabrutinib Treatment C
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 55 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Glendale, California
Source: ClinicalTrials.gov public record
Updated Jul 22, 2020 · Synced Oct 1, 2026, 7:43 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Determining Risk Factors for Successful PPI Weaning

NCT03226054
View directory record Official record
Conditions
Gastroesophageal Reflux
Interventions
Lifestyle Modifications
Behavioral
Lead sponsor
Mount Carmel Health System
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Westerville, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 4, 2018 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Not applicable Interventional Results available

HALO Patient Registry: Ablation of Barrett's Esophagus

NCT00848237
View directory record Official record
Conditions
Barrett Esophagus
Interventions
Radiofrequency Ablation (HALO Ablation Systems)
Device
Lead sponsor
Medtronic - MITG
Industry
Eligibility
Not listed
Enrollment
5,521 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2014
U.S. locations
1
States / cities
Knoxville and Other US Cities, California
Source: ClinicalTrials.gov public record
Updated Feb 5, 2016 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Not applicable Interventional

Economic Impact of Guidelines for Gastroesophageal Reflux Disease

NCT00057174
View directory record Official record
Conditions
Gastroesophageal Reflux Disease, Health Economics
Interventions
Disease management of gastroesophageal reflux disease
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years and older
Enrollment
484 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2004
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 7, 2015 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Gastric pH and Anthocyanin Absorption

NCT01122160
View directory record Official record
Conditions
Anthocyanin Metabolism
Interventions
omeprazole, placebo
Drug
Lead sponsor
USDA Beltsville Human Nutrition Research Center
Federal
Eligibility
22 Years to 59 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Beltsville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 23, 2013 · Synced Oct 1, 2026, 7:43 AM EDT
Terminated No phase listed Observational

Effect of Acid Blockade on Microbiota and Inflammation in Cystic Fibrosis (CF)

NCT02769637
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
PPI treatment
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years to 21 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
2
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 27, 2018 · Synced Oct 1, 2026, 7:43 AM EDT
Terminated Phase 1 Interventional

A Study to Evaluate the Safety, Pharmacokinetics, and Activity of GDC-0587 as a Monotherapy and in Combination With Giredestrant in Participants With Locally Advanced or Metastatic Estrogen Receptor-Positive and Human Epidermal Growth Factor Receptor 2-Negative (ER+/HER2-) Breast Cancer

NCT07214662
View directory record Official record
Conditions
Breast Cancer
Interventions
GDC-0587, Giredestrant, Omeprazole
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
2
States / cities
Grand Rapids, Michigan • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Aug 21, 2026 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 4 Interventional Results available

The CALIBER Study Randomized Controlled Trial of LINX Versus Double-Dose Proton Pump Inhibitor Therapy for Reflux Disease

NCT02505945
View directory record Official record
Conditions
GERD Gastroesophageal Reflux Disease
Interventions
Omeprazole, LINX Reflux Management System
Drug · Device
Lead sponsor
Torax Medical Incorporated
Industry
Eligibility
21 Years and older
Enrollment
152 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
21
States / cities
Mobile, Alabama • Heber Springs, Arkansas • Los Angeles, California + 18 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2019 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 3 Interventional

Efficacy/Safety of Lansoprazole in Patients With Frequent Heartburn

NCT00390390
View directory record Official record
Conditions
Heartburn
Interventions
Lansoprazole
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years and older
Enrollment
576 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
30
States / cities
Mobile, Alabama • Little Rock, Alaska • Chandler, Arizona + 26 more
Source: ClinicalTrials.gov public record
Updated May 25, 2010 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Not applicable Interventional Results available

Anticoagulation With Enhanced Gastrointestinal Safety (AEGIS) Trial

NCT05085405
View directory record Official record
Conditions
Upper Gastrointestinal Bleeding
Interventions
Clinician notification, Clinician Notification with Nurse Facilitation, Clinician Notification / Patient Activation, Clinician Notification with Nurse Facilitation / Patient Activation
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 29, 2023 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 4 Interventional Results available

Impact of Timing on the Efficacy of Zegerid 40 mg in Healing Reflux Esophagitis: A Pilot Study

NCT00693225
View directory record Official record
Conditions
Erosive Esophagitis
Interventions
Omeprazole/sodium bicarbonate
Drug
Lead sponsor
Yvonne Romero
Other
Eligibility
18 Years and older
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 20, 2012 · Synced Oct 1, 2026, 7:43 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Microbiome, Bile Acids, and Notch in Barrett's Esophagus (BE)

NCT05524844
View directory record Official record
Conditions
Barrett Esophagus, Esophageal Adenocarcinoma
Interventions
Sample Collection, Endoscopy results, Dietary questionnaire
Other
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 11, 2025 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Investigate the Effect of Increased Gastric pH on the Oral Bioavailability of the Orexin-2 Receptor Antagonist JNJ-42847922 in Healthy Participants

NCT02475161
View directory record Official record
Conditions
Healthy
Interventions
JNJ-42847922, Rabeprazole
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Examine the Effect of Omeprazole, Famotidine, and an Acidic Beverage on the Pharmacokinetics of Entinostat in Healthy Adult Subjects

NCT02922933
View directory record Official record
Conditions
Volunteers, Healthy Volunteers, Human Volunteers, Normal Volunteers
Interventions
entinostat, Omeprazole, Famotidine
Drug · Dietary Supplement
Lead sponsor
Syndax Pharmaceuticals
Industry
Eligibility
19 Years to 55 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
2
States / cities
Tempe, Arizona • Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Early Phase 1 Interventional

The Effect of Sucralfate Slurry in Patients With Eosinophilic Esophagitis

NCT02353078
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
Sucralfate, Intraluminal Impedance, Intraluminal Impedance
Drug · Procedure · Device
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 11, 2017 · Synced Oct 1, 2026, 7:43 AM EDT
Terminated Not applicable Interventional Results available

COPD Patients Diagnosed With GERD,COPD Exacerbations After Treatment With High Dose PPI

NCT00523367
View directory record Official record
Conditions
Gastroesophageal Reflux, Chronic Obstructive Pulmonary Disease
Interventions
24 hour pH testing
Procedure
Lead sponsor
University of Florida
Other
Eligibility
40 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 18, 2013 · Synced Oct 1, 2026, 7:43 AM EDT
Terminated Phase 3 Interventional

Esophageal Metaplasia Using a Novel Antibody: Reversibility by Proton Pump Inhibitor

NCT00161200
View directory record Official record
Conditions
Esophageal Metaplasia
Interventions
Ranitidine & Pantoprazole
Drug
Lead sponsor
University of Medicine and Dentistry of New Jersey
Other
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2006
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 11, 2009 · Synced Oct 1, 2026, 7:43 AM EDT
Completed Phase 2 Interventional Results available

IRX-2 Regimen in Patients With Newly Diagnosed Stage II, III, or IVA Squamous Cell Carcinoma of the Oral Cavity

NCT02609386
View directory record Official record
Conditions
Squamous Cell Carcinoma of the Oral Cavity
Interventions
IRX-2, Cyclophosphamide, Indomethacin, Zinc-containing multivitamin, Omeprazole
Biological · Drug · Dietary Supplement
Lead sponsor
Brooklyn ImmunoTherapeutics, LLC
Industry
Eligibility
18 Years and older
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
13
States / cities
Tucson, Arizona • Little Rock, Arkansas • Los Angeles, California + 10 more
Source: ClinicalTrials.gov public record
Updated Jan 30, 2024 · Synced Oct 1, 2026, 7:43 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

ALPCO/Calprotectin CLIA Assay: Expected Values of Calprotectin in Healthy Subjects

NCT07089420
View directory record Official record
Conditions
IBD (Inflammatory Bowel Disease), IBS - Irritable Bowel Syndrome, Crohn Disease (CD), UC - Ulcerative Colitis
Interventions
ALPCO Calprotectin CLIA
Device
Lead sponsor
American Laboratory Products Company
Industry
Eligibility
22 Years and older
Enrollment
121 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Salem, New Hampshire
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Oct 1, 2026, 7:43 AM EDT
Suspended No phase listed Observational Accepts healthy volunteers

Morphological Markers of Gastroesophageal Reflux Disease (GERD)

NCT01921686
View directory record Official record
Conditions
Eosinophilic Esophagitis, Gastroesophageal Reflux Disease
Interventions
Sample collection and Questionnaire
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
8 Years to 18 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Oct 1, 2026, 7:43 AM EDT
Recruiting Phase 2Phase 3 Interventional Accepts healthy volunteers

Comparison of Early Proton Pump Inhibitor Initiation Versus Usual Care on Acute Kidney Injury in Hemorrhagic Shock Patients

NCT06531642
View directory record Official record
Conditions
Acute Kidney Injury
Interventions
Protonix (Pantoprazole) 40 mg q 12 hrs for 2 days, Protonix (pantoprazole) 40 mg q 24 hrs for 2 days
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Oct 1, 2026, 7:43 AM EDT