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ClinicalTrials.gov public records Last synced Oct 17, 2026, 3:32 AM EDT

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Showing 241–264 of 316 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Omeprazole Clear all
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Bioequivalence of Single Oral Dose of Esomeprazole Capsule and Tablet Formulation in Healthy Participants

NCT03083639
View directory record Official record
Conditions
Healthy Participants
Interventions
Esomeprazole Capsule, Esomeprazole Tablet
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 55 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Lenexa, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 14, 2019 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate Platlet Aggregation of Clopidogrel, EC Aspirin 81 mg, EC Omeprazole 40 mg Compare to PA32540

NCT01557335
View directory record Official record
Conditions
Platelet Aggregation
Interventions
Plavix® and PA32540, EC aspirin (Bayer®) ,EC omeprazole (Prilosec®) , Clopidogrel (Plavix®)
Drug
Lead sponsor
POZEN
Industry
Eligibility
40 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 19, 2012 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Multiple-Dose Pharmacokinetics Study of Two Gefapixant (AF-219/MK-7264) Formulations

NCT02492776
View directory record Official record
Conditions
Healthy
Interventions
Omeprazole, Gefapixant
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 55 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 22, 2022 · Synced Oct 17, 2026, 3:32 AM EDT
Not yet recruiting Phase 3 Interventional

Personalized vs Standard of Care Treatment for Helicobacter Pylori Eradication Among Veterans

NCT07104318
View directory record Official record
Conditions
Helicobacter Pylori
Interventions
Bismuth quadruple therapy with optimized proton pump inhibitor (PPI), Bismuth quadruple therapy with standard proton pump inhibitor (PPI), Clarithromycin triple therapy with optimized proton pump inhibitor (PPI), Clarithromycin triple therapy with standard PPI, Standard bismuth quadruple therapy
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
360 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2030
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Oct 9, 2026 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 3 Interventional Results available

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

NCT00960869
View directory record Official record
Conditions
Gastric Ulcer
Interventions
PA32540, EC-Aspirin 325 mg
Drug
Lead sponsor
POZEN
Industry
Eligibility
55 Years and older
Enrollment
519 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 Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Phase 1 Study of Novel GS-9973 Tablet Formulations to Evaluate the Effect of Acid Reducing Agents, Relative Bioavailability, and Food Effect on GS-9973 Pharmacokinetics

NCT01841489
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia
Interventions
Treatment A, Treatment B, Treatment C, Treatment D, Treatment E, Treatment F, Treatment G, Treatment H, Treatment I, Treatment J
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
18 Years to 45 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Daytona Beach, Florida
Source: ClinicalTrials.gov public record
Updated Feb 7, 2014 · Synced Oct 17, 2026, 3:32 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 17, 2026, 3:32 AM EDT
Completed Phase 3 Interventional Results available

An Open-Label Immunogenicity and Pharmacokinetics Study of Daclizumab High Yield Process Prefilled Syringe in Relapsing Remitting Multiple Sclerosis

NCT01462318
View directory record Official record
Conditions
Relapsing-Remitting Multiple Sclerosis
Interventions
Midazolam, Caffeine, S-warfarin, Vitamin K, Omeprazole, Dextromethorphan, BIIB019 (Daclizumab)
Drug · Other · Biological
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 65 Years
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
7
States / cities
Centennial, Colorado • Washington D.C., District of Columbia • Lake Barrington, Illinois + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 14, 2017 · Synced Oct 17, 2026, 3:32 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 17, 2026, 3:32 AM EDT
Terminated Phase 3 Interventional Results available

Nexium Study To Suppress Nausea During Chemotherapy

NCT00206440
View directory record Official record
Conditions
Nausea
Interventions
esomeprazole, Placebo
Drug · Other
Lead sponsor
Baylor Breast Care Center
Other
Eligibility
18 Years and older · Female only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 6, 2018 · Synced Oct 17, 2026, 3:32 AM EDT
Recruiting Phase 3 Interventional

A Study Evaluating the Efficacy and Safety of Inavolisib Plus Fulvestrant Compared With Alpelisib Plus Fulvestrant in Participants With HR-Positive, HER2-Negative, PIK3CA Mutated, Locally Advanced or Metastatic Breast Cancer Post CDK4/6i and Endocrine Combination Therapy

NCT05646862
View directory record Official record
Conditions
Breast Cancer
Interventions
Inavolisib, Fulvestrant, Alpelisib, Bupropion, Omeprazole, Midazolam
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
39
States / cities
Greenbrae, California • Los Alamitos, California • Los Angeles, California + 32 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Multiple-Dose Pharmacokinetics Study of Three Gefapixant (AF-219/MK-7264) Formulations

NCT02790840
View directory record Official record
Conditions
Healthy
Interventions
Omeprazole, Gefapixant
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 55 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Apr 18, 2017 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 3 Interventional Results available

Study of Acid Reflux in Asthma

NCT00069823
View directory record Official record
Conditions
Asthma, Lung Diseases, Lung Diseases, Obstructive
Interventions
Esomeprazole, Placebo proton pump inhibitor
Drug
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years and older
Enrollment
403 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
20
States / cities
Birmingham, Alabama • San Diego, California • Denver, Colorado + 17 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2012 · Synced Oct 17, 2026, 3:32 AM 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 29, 2021 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Not applicable Interventional

A Prospective Trial to Assess Cost and Clinical Outcomes of a Clinical Pharmacogenomic Program

NCT02297126
View directory record Official record
Conditions
Adverse Drug Reaction
Interventions
Pharmacogenetic Intervention Arm (pharmacogenetic testing)
Other
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
4,465 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jan 8, 2021 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study of Effect of Food and a Proton Pump Inhibitor on Selpercatinib (LY3527723) in Healthy Participants

NCT05468164
View directory record Official record
Conditions
Healthy
Interventions
Selpercatinib, Omeprazole
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 19, 2025 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 3 Interventional

Management of Myocardial Injury After Noncardiac Surgery Trial

NCT01661101
View directory record Official record
Conditions
Myocardial Injury After Noncardiac Surgery (MINS)
Interventions
Dabigatran, Placebo (for Dabigatran), Omeprazole, Placebo (for Omeprazole)
Drug
Lead sponsor
Population Health Research Institute
Other
Eligibility
45 Years and older
Enrollment
1,754 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
7
States / cities
Kansas City, Kansas • Buffalo, New York • Rochester, New York + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2018 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Comparison of Prilosec Over-the-counter (OTC)® Versus Prevacid® for Gastric Acid Suppression

NCT00903448
View directory record Official record
Conditions
Healthy
Interventions
Prilosec OTC (omeprazole-magnesium), Prevacid
Drug
Lead sponsor
Procter and Gamble
Industry
Eligibility
18 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Dec 31, 2010 · Synced Oct 17, 2026, 3:32 AM EDT
Completed No phase listed Observational

Influence of the Proton Pump Inhibitor Omeprazole on the Anti-Platelet of P2Y12 Antagonists in Subjects With Coronary and Peripheral Artery Disease

NCT01018940
View directory record Official record
Conditions
Coronary Artery Disease, Peripheral Artery Disease
Interventions
Not listed
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Dec 4, 2014 · Synced Oct 17, 2026, 3:32 AM 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 12, 2022 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Results available

Implementation of PPI Medication PGX Testing

NCT02794844
View directory record Official record
Conditions
Gastroesophageal Reflux
Interventions
Genotype Guided PPI Dosing
Drug
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
2 Years to 17 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Nov 21, 2018 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 2 Interventional

A Study to Evaluate the Efficacy and Safety of Arbaclofen Placarbil (XP19986) as Adjunctive Therapy in Subjects With Gastroesophageal Reflux Disease (GERD)

NCT00978016
View directory record Official record
Conditions
Gastroesophageal Reflux Disease
Interventions
arbaclofen placarbil-Cohort 1, Placebo-Cohort 5, arbaclofen placarbil-Cohort 2, arbaclofen placarbil-Cohort 3, arbaclofen placarbil-Cohort 4, PPI
Drug
Lead sponsor
XenoPort, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
460 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
62
States / cities
Huntsville, Alabama • Chandler, Arizona • Mesa, Arizona + 56 more
Source: ClinicalTrials.gov public record
Updated Feb 21, 2021 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Results available

A Pharmacokinetic Study of RO5185426 in Combination With a Drug Cocktail in Patients With Metastatic Melanoma

NCT01001299
View directory record Official record
Conditions
Malignant Melanoma
Interventions
Drug cocktail, RO5185426
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
5
States / cities
Los Angeles, California • Boston, Massachusetts • Nashville, Tennessee + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 15, 2017 · Synced Oct 17, 2026, 3:32 AM EDT
Completed Phase 4 Interventional

Nexium 40mg Once Daily vs Prevacid 30mg Twice a Day for Control of Severe GERD

NCT00295685
View directory record Official record
Conditions
GERD
Interventions
Antacids
Drug
Lead sponsor
Digestive & Liver Disease Specialists
Other
Eligibility
18 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 25, 2009 · Synced Oct 17, 2026, 3:32 AM EDT