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Showing 1–24 of 102 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Omeprazole 40 mg Clear all
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 22, 2026, 4:46 AM EDT
Withdrawn Early Phase 1 Interventional

CYP2C19 Genotype Predictor of Gastric Acid Suppression

NCT01824199
View directory record Official record
Conditions
Esophagitis
Interventions
Omeprazole
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 10, 2017 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study of LY3484356 in Healthy Female Participants

NCT04840888
View directory record Official record
Conditions
Healthy
Interventions
LY3484356, Omeprazole, Itraconazole, Carbamazepine, Midazolam
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years to 65 Years · Female only
Enrollment
82 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
2
States / cities
Daytona Beach, Florida • Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Sep 22, 2026, 4:46 AM 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 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study Evaluating Effect of Esomeprazole, Omeprazole or Lansoprazole on the Pharmacodynamics (PD) and Pharmacokinetics (PK) of Clopidogrel

NCT01147588
View directory record Official record
Conditions
Healthy
Interventions
lansoprazole, omeprazole, esomeprazole, clopidogrel
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 55 Years
Enrollment
149 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 27, 2011 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Trial to Evaluate the Effect of Esomeprazole on the Pharmacokinetics of Emraclidine in Healthy Adult Participants

NCT06366243
View directory record Official record
Conditions
Healthy Participants
Interventions
Emraclidine, Esomeprazole
Drug
Lead sponsor
Cerevel Therapeutics, LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Dilworth, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 23, 2024 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Which Supraesophageal Reflux Symptoms Reliably Respond to Proton-Pump-Inhibitor (PPI) Therapy

NCT00170001
View directory record Official record
Conditions
Gastroesophageal Reflux
Interventions
Nexium, Sugar Pill
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 14, 2011 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the Effects of Food and Esomeprazole on the Pharmacokinetics of Crizotinib in a Coated Microsphere Formulation.

NCT03137134
View directory record Official record
Conditions
Healthy
Interventions
Crizotinib, Esomeprazole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 30, 2017 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

The Effect of Omeprazole on the Pharmacokinetics of Dasatinib in Healthy Subjects

NCT00655746
View directory record Official record
Conditions
Healthy
Interventions
Dasatinib + Omeprazole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years to 50 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Hamilton, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 14, 2009 · Synced Sep 22, 2026, 4:46 AM EDT
Recruiting Phase 4 Interventional

The Mechanism Versus PPI Trial

NCT06999577
View directory record Official record
Conditions
Laryngopharyngeal Reflux, Cough, Throat Clearing, Dysphonia, Reflux
Interventions
Omeprazole 40 MG, Laryngeal Recalibration Therapy, GERD Lifestyle Recommendations
Drug · Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years to 89 Years
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
San Deigo, California
Source: ClinicalTrials.gov public record
Updated Jul 31, 2025 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 4 Interventional

Evaluation of 24-Hour Intragastric pH Using Esomeprazole, Lansoprazole, and Pantoprazole in Hispanic Patients With GERD

NCT00410592
View directory record Official record
Conditions
Gastroesophageal Reflux Disease
Interventions
Esomeprazole 40mg, Pantoprazole 40mg, Lansoprazole 30mg
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 69 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
7
States / cities
Anaheim, California • Orange, California • San Diego, California + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 10, 2009 · Synced Sep 22, 2026, 4:46 AM 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 22, 2026, 4:46 AM 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 22, 2026, 4:46 AM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Incidence of Gastric Ulcers Following Administration of Either PA32540 or Enteric Coated Aspirin 325 mg in Subjects Who Are at Risk for Developing Aspirin-Associated Ulcers

NCT00961350
View directory record Official record
Conditions
Gastric Ulcer
Interventions
PA32540, EC Aspirin 325
Drug
Lead sponsor
POZEN
Industry
Eligibility
55 Years and older
Enrollment
530 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 17, 2016 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the One-way Interaction of Calcium Carbonate, Omeprazole, or Rifampin on ACP-196

NCT04914936
View directory record Official record
Conditions
Healthy Participants
Interventions
ACP-196, Calcium carbonate, Omeprazole, Rifampin
Drug
Lead sponsor
Acerta Pharma BV
Industry
Eligibility
18 Years to 65 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 6, 2021 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 4 Interventional Results available

Ulcer Prevention Study in Post Gastric Bypass Patients

NCT00557349
View directory record Official record
Conditions
Marginal Ulcers
Interventions
Omeprazole, Famotidine
Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 18, 2017 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Study of Intragastric pH Profile After 5 Days Pantoprazole 40 mg iv Followed by Oral Esomeprazole 40 mg po or Oral Pantoprazole 40 mg po

NCT00206050
View directory record Official record
Conditions
Healthy
Interventions
Esomeprazole, pantoprazole
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Jan 20, 2011 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of the Drug Interactions Between Danicopan and Cyclosporine, Tacrolimus, Antacids, and Omeprazole in Healthy Adults

NCT05109390
View directory record Official record
Conditions
Healthy
Interventions
Danicopan, Cyclosporine, Tacrolimus, Calcium Carbonate, Aluminum/Magnesium Hydroxide/Simethicone, Omeprazole
Drug
Lead sponsor
Alexion Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 22, 2026, 4:46 AM 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 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study in Healthy Volunteers to Assess Effect of Omeprazole and Ranitidine on the Pharmacokinetics of Vandetanib

NCT01539655
View directory record Official record
Conditions
Medullary Thyroid Cancer
Interventions
vandetanib, omeprazole, ranitidine
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated May 1, 2017 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Drug-Drug Interaction Study of Omeprazole and PA21

NCT01452906
View directory record Official record
Conditions
Healthy
Interventions
PA21 and Omeprazole with food, No PA21; Omeprazole with food, PA21 with food, Omeprazole 2hrs later
Drug
Lead sponsor
Vifor Pharma
Industry
Eligibility
20 Years to 50 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Anaheim, California
Source: ClinicalTrials.gov public record
Updated Dec 11, 2011 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 4 Interventional

NEXIUM® in the Treatment of Moderate and Severe Erosive Esophagitis

NCT00206180
View directory record Official record
Conditions
Erosive Esophagitis, Reflux Esophagitis, Gastroesophageal Reflux Disease
Interventions
esomeprazole magnesium (oral medication)
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 75 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2005
U.S. locations
39
States / cities
Alabaster, Alabama • Anaheim, California • Dinuba, California + 36 more
Source: ClinicalTrials.gov public record
Updated Mar 25, 2009 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

GSK1325756 Relative Bioavailability Study in Healthy Elderly Subjects

NCT03457727
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Danirixin, Omeprazole
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
65 Years to 80 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated May 18, 2021 · Synced Sep 22, 2026, 4:46 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Does Omeprazole Decrease Intestinal Calcium Absorption?

NCT00582972
View directory record Official record
Conditions
Osteoporosis, Achlorhydria, GERD, Hip Fracture
Interventions
Omeprazole
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 14, 2013 · Synced Sep 22, 2026, 4:46 AM EDT