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Showing 1–24 of 82 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Omeprazole 20 mg Clear all
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Randomized Trial of Medical and Surgical Treatments for Patients With GERD Symptoms That Are Refractory to Proton Pump Inhibitors

NCT01265550
View directory record Official record
Conditions
GERD
Interventions
Nissen fundoplication, baclofen, Desipramine
Device · Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 64 Years
Enrollment
366 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
15
States / cities
Birmingham, Alabama • Tucson, Arizona • Loma Linda, California + 12 more
Source: ClinicalTrials.gov public record
Updated Jan 21, 2020 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vecam 40/300 and Vecam 20/300 Compared to Omeprazole 20 mg on Gastric pH

NCT00818870
View directory record Official record
Conditions
Gastroesophageal Reflux
Interventions
Omeprazole, Vecam
Drug
Lead sponsor
Vecta Ltd.
Industry
Eligibility
18 Years to 55 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jan 26, 2010 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Deprescribing Proton Pump Inhibitors to Reduce Post-TIPS Hepatic Encephalopathy

NCT05070351
View directory record Official record
Conditions
Hepatic Encephalopathy
Interventions
PPI deprescribing
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 9, 2026 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 3 Interventional

Esomeprazole for Prevention of Upper Gastrointestinal Symptoms Associated With Continuous Use of NSAIDs

NCT00241553
View directory record Official record
Conditions
NSAIDs, Upper GI Symptoms
Interventions
Esomeprazole
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years and older
Enrollment
276 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2003
U.S. locations
31
States / cities
Tallassee, Alabama • Phoenix, Arizona • Garden Grove, California + 28 more
Source: ClinicalTrials.gov public record
Updated Jan 23, 2011 · Synced Sep 21, 2026, 9:06 PM EDT
Terminated Early Phase 1 Interventional

High Dose Omeprazole in Patients With Pancreatic Cancer

NCT04930991
View directory record Official record
Conditions
Exocrine Pancreatic Cancer
Interventions
Omeprazole
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 100 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated May 31, 2026 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug-Drug Interaction Study of Pacritinib and CYP450,Transporter Substrates, and CYP450 3A4 in Healthy Male Subjects

NCT05657613
View directory record Official record
Conditions
Drug Interactions
Interventions
CYP450 Cocktail and Transporter Substrates with Pacritinib, Part 2 -Group A Bosentan 125 mg (CYP450 3A4 inducer) with Pacritinib, Part 2 Group B - Fluconazole (CYP450 3A4 inhibitor) with Pacritinib
Drug
Lead sponsor
CTI BioPharma
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Oct 16, 2024 · Synced Sep 21, 2026, 9:06 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 21, 2026, 9:06 PM EDT
Terminated Phase 3 Interventional

Clopidogrel and the Optimization of Gastrointestinal Events (COGENT-1)

NCT00557921
View directory record Official record
Conditions
Acute Coronary Syndrome, Myocardial Infarction, Coronary Artery Disease, Percutaneous Coronary Intervention
Interventions
CGT-2168 (clopidogrel 75 mg/omeprazole 20 mg) and aspirin, Plavix (clopidogrel 75 mg) and aspirin
Drug
Lead sponsor
Cogentus Pharmaceuticals
Industry
Eligibility
21 Years and older
Enrollment
5,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
247
States / cities
Alexander City, Alabama • Birmingham, Alabama • Geneva, Alabama + 205 more
Source: ClinicalTrials.gov public record
Updated Jan 27, 2009 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pharmacokinetic and Safety Study of Cenicriviroc and Acid Reducing Agents When Dosed Alone or in Combination

NCT02684799
View directory record Official record
Conditions
Healthy
Interventions
Cenicriviroc, Omeprazole, Famotidine
Drug
Lead sponsor
Tobira Therapeutics, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 23, 2017 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the Effect on 24-hour, Intragastric pH of RAB ER 50-mg Capsules Compared With Esomeprazole (Nexium) 40 mg Capsules and Rabeprazole (Aciphex) 20-mg Tablets

NCT01153659
View directory record Official record
Conditions
Healthy
Interventions
E3810, Aciphex (rabeprazole), Nexium (esomeprazole)
Drug
Lead sponsor
Eisai Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Oct 31, 2013 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Early Phase 1 Interventional

Vitamin D Supplementation on 15-Prostaglandin Dehydrogenase Expression in Barrett's Esophagus

NCT01465113
View directory record Official record
Conditions
Short Segment Barrett's Esophagus, Long Segment Barrett's Esophagus
Interventions
Omeprazole, Vitamin D3, upper endoscopy, Metformin
Drug · Procedure
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
3
States / cities
Beachwood, Ohio • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 9, 2016 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 4 Interventional Results available

Does Intensive Acid Suppression Reduce Esophageal Inflammation and Recurrent Barrett's Esophagus Following Ablation?

NCT01093755
View directory record Official record
Conditions
Inflammation, Barrett's Esophagus
Interventions
dexlansoprazole, Omeprazole
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 90 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 16, 2016 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional

Drug-drug Interaction Trial With Tralokinumab in Moderate to Severe Atopic Dermatitis - ECZTRA 4

NCT03556592
View directory record Official record
Conditions
Atopic Dermatitis
Interventions
Tralokinumab, Caffeine, Warfarin, Omeprazole, Metoprolol, Midazolam Hydrochloride
Drug
Lead sponsor
LEO Pharma
Industry
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
9
States / cities
Little Rock, Arkansas • Rogers, Arkansas • San Diego, California + 5 more
Source: ClinicalTrials.gov public record
Updated Feb 23, 2025 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional

Pharmacokinetic Study to Evaluate the Effect of a Single Dose of Guselkumab (CNTO 1959) on CYP 450 Enzyme Activities After Subcutaneous Administration in Participants With Psoriasis

NCT02397382
View directory record Official record
Conditions
Psoriasis
Interventions
Guselkumab, Midazolam, Warfarin, Omeprazole, Dextromethorphan, Caffeine
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
8
States / cities
Anniston, Alabama • North Hollywood, California • Orlando, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 19, 2017 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug-Drug Interaction Study to Evaluate the Effects of Ecopipam on the Pharmacokinetics of Multiple Substrates for Drug Metabolism and Transport

NCT05334108
View directory record Official record
Conditions
Drug Interaction
Interventions
Ecopipam, Cohort 1 Probe Substrate Cocktail, Cohort 2 Probe Substrate, Cohort 3 Probe Substrate Cocktail
Drug · Combination Product
Lead sponsor
Emalex Biosciences Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Dec 11, 2022 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Effect of Increased Stomach pH on Evacetrapib in Healthy Participants

NCT02365558
View directory record Official record
Conditions
Healthy
Interventions
Evacetrapib, Omeprazole
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years to 65 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 2, 2018 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Impact of Proton Pump Inhibitors on the Fecal Microbiome

NCT01822977
View directory record Official record
Conditions
Healthy, Clostridium Difficile Infection
Interventions
omeprazole
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 19, 2014 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

The Effect of Protein on Calcium Absorption and Gastric Acid Production

NCT00719160
View directory record Official record
Conditions
Osteoporosis
Interventions
esomeprazole, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 45 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2008
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 5, 2020 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Comparison of Small Bowel Lesions Associated With Celecoxib Versus Ibuprofen Plus Omeprazole

NCT00640809
View directory record Official record
Conditions
Bowel Diseases, Inflammatory
Interventions
Celecoxib, Placebo, Ibuprofen plus Omeprazole
Drug · Other
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
408 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2004
U.S. locations
12
States / cities
Scottsdale, Arizona • La Jolla, California • Los Angeles, California + 8 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Sep 21, 2026, 9:06 PM EDT
Withdrawn Phase 4 Interventional Accepts healthy volunteers

Helicobacter Pylori and Body Iron in Adults

NCT03146325
View directory record Official record
Conditions
Helicobacter Pylori Infection
Interventions
BISMUTH TETRACYCLINE METRONIDAZOLE OMEPRAZOLE, MATCHING PLACEBO
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 64 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
El Paso, Texas
Source: ClinicalTrials.gov public record
Updated May 8, 2017 · Synced Sep 21, 2026, 9:06 PM EDT
Withdrawn Phase 3 Interventional

Safety, Efficacy of Pylera BID Dosing in Eradication of H. Pylori

NCT00712413
View directory record Official record
Conditions
Helicobacter Pylori Infection
Interventions
OBMT
Drug
Lead sponsor
Forest Laboratories
Industry
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
2
States / cities
Ann Arbor, Michigan • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 8, 2017 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study With Proton Pump Inhibitor

NCT00357240
View directory record Official record
Conditions
HIV Infections
Interventions
Atazanavir, Atazanavir/Ritonavir, Atazanavir/Ritonavir+Omeprazole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years to 50 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Hamilton, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 7, 2011 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 3 Interventional Results available

PLUTO: Pediatric Lipid-redUction Trial of rOsuvastatin

NCT00355615
View directory record Official record
Conditions
Familial Hypercholesterolemia
Interventions
Rosuvastatin, Placebo
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
10 Years to 17 Years
Enrollment
173 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
4
States / cities
Los Angeles, California • Hyde Park, New York • Cincinnati, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 30, 2011 · Synced Sep 21, 2026, 9:06 PM EDT
Completed Phase 3 Interventional Results available

Efficacy of Esomeprazole in Patients With Frequent Heartburn

NCT01370525
View directory record Official record
Conditions
Heartburn
Interventions
Esomeprazole
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years and older
Enrollment
340 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011
U.S. locations
10
States / cities
Sacramento, California • Seminole, Florida • Meridian, Idaho + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 13, 2013 · Synced Sep 21, 2026, 9:06 PM EDT