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ClinicalTrials.gov public records Last synced Oct 5, 2026, 6:59 AM EDT

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Showing 1–24 of 73 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: omeprazole (proton pump inhibitor) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Long-term Use of Proton Pump Inhibitors May Cause Vitamin B12 Deficiency in the Institutionalized Elderly

NCT00843453
View directory record Official record
Conditions
Vitamin B12 Deficiency
Interventions
blood collection, treatment (cyanocobalamin nasal spray)
Other · Drug
Lead sponsor
University of Delaware
Other
Eligibility
60 Years to 89 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
2
States / cities
Manchester, Maryland • Timonium, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 23, 2009 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 4 Interventional Results available

Pilot Study To Investigate The Association Between Acid Control And Heartburn Symptoms After Proton Pump Inhibitor Treatment

NCT02708355
View directory record Official record
Conditions
Heartburn
Interventions
Esomeprazole 20 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
22 Years to 65 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
2
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Apr 19, 2017 · Synced Oct 5, 2026, 6:59 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Impact of Lactobacillus Rhamnosus GG on Proton Pump Inhibitor-Induced Gut Dysbiosis

NCT05517928
View directory record Official record
Conditions
Healthy
Interventions
Omeprazole, Lactobacillus rhamnosus GG, Placebo
Drug · Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 8, 2026 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Effect of Proton Pump Inhibitors on Gut Microbiota and Systemic Inflammation in Older Adults

NCT02844621
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Omeprazole
Drug
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
60 Years and older
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jan 20, 2017 · Synced Oct 5, 2026, 6:59 AM EDT
Withdrawn Phase 2 Interventional

Efficacy Study of Botulinum Toxin (BOTOX) Injections to Treat Vocal Fold Granulomas

NCT01678053
View directory record Official record
Conditions
Contact Ulcer of Vocal Folds, Granuloma of Vocal Cords, Granuloma, Laryngeal, Granuloma
Interventions
onabotulinumtoxinA, omeprazole (proton pump inhibitor)
Drug
Lead sponsor
Phillip Song, MD
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 28, 2017 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 2 Interventional Results available

Effect of Proton Pump Inhibitors on CF Pulmonary Exacerbations

NCT01983774
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Esomeprazole, Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 65 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 17, 2022 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 2 Interventional

The Use of Oral Omeprazole and Intravenous Pantoprazole in Patients With Hypersecretion of Gastric Acid

NCT00001191
View directory record Official record
Conditions
Gastrinoma, Zollinger Ellison Syndrome
Interventions
Pantoprazole, Omeprazole
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
1983 – 2007
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 5, 2026, 6:59 AM EDT
Recruiting Not applicable Interventional

GERD Infant Feeding Therapeutics Trial (GIFT Trial)

NCT06114836
View directory record Official record
Conditions
GERD in Infants
Interventions
Omeprazole, AR formula
Drug · Other
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
1 Day to 8 Months
Enrollment
369 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 23, 2026 · Synced Oct 5, 2026, 6:59 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 15, 2013 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 4 Interventional Results available

Levothyroxine Sodium in Thyroidectomized Patients Taking Proton Pump Inhibitors

NCT03094416
View directory record Official record
Conditions
Hypothyroidism;Postablative
Interventions
levothyroxine sodium capsule, Proton pump inhibitor (PPI), Levothyroxine Sodium (LT4) Tablets
Drug
Lead sponsor
IBSA Institut Biochimique SA
Industry
Eligibility
18 Years to 65 Years
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
9
States / cities
La Jolla, California • Ventura, California • Washington D.C., District of Columbia + 6 more
Source: ClinicalTrials.gov public record
Updated Apr 5, 2022 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 3 Interventional Results available

ERADICATE Hp - Treating Helicobacter Pylori With RHB-105

NCT01980095
View directory record Official record
Conditions
Dyspepsia, Helicobacter Pylori Infection
Interventions
RHB-105, Placebo
Drug
Lead sponsor
RedHill Biopharma Limited
Industry
Eligibility
18 Years to 65 Years
Enrollment
119 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
12
States / cities
Anaheim, California • Chino, California • Jupiter, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Sep 24, 2019 · Synced Oct 5, 2026, 6:59 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 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Study of the Effect of Food and a Proton Pump Inhibitor (PPI; Omeprazole) on LOXO-305 in Healthy Participants

NCT05134350
View directory record Official record
Conditions
Healthy Volunteers
Interventions
LOXO-305, Omeprazole
Drug
Lead sponsor
Loxo Oncology, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Daytona Beach, Florida
Source: ClinicalTrials.gov public record
Updated Jan 10, 2025 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Vyvanse and Adderall XR Given Alone and in Combination With Prilosec OTC

NCT00746733
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Lisdexamfetamine Dimesylate, Adderall XR (mixed salts amphetamine)
Drug
Lead sponsor
Shire
Industry
Eligibility
18 Years to 45 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 14, 2021 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pharmacokinetics and Safety of GSK1325756 in Elderly Subjects and Adult Subjects of in the Fed and Fasted States and in the Presence of a Proton Pump Inhibitors

NCT01209104
View directory record Official record
Conditions
Nutritional Status
Interventions
GSK1325756
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
40 Years to 80 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 14, 2017 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Impact of Omeprazole on the Pharmacokinetics of Sotorasib Co-administered With an Acidic Beverage in Healthy Volunteers

NCT05497557
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Omeprazole, Sotorasib
Drug
Lead sponsor
Amgen
Industry
Eligibility
18 Years to 60 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jan 19, 2024 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of Interaction of Zasocitinib (TAK-279) With Other Medicines in Healthy Adults

NCT06793943
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Zasocitinib, COC, Metformin, Digoxin, Esomeprazole
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 65 Years
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Apr 4, 2025 · Synced Oct 5, 2026, 6:59 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 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Trial to Evaluate the Effect of the Proton Pump Inhibitor Esomeprazole on the Single-dose Pharmacokinetics (PK) of Oral TAK-906 in Healthy Adult Participants

NCT03849690
View directory record Official record
Conditions
Healthy Volunteers
Interventions
TAK-906, Esomeprazole
Drug
Lead sponsor
Millennium Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 15, 2021 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 2Phase 3 Interventional Results available

The Role Of Gastroesophageal Reflux Disease (GERD) in Eosinophilic Esophagitis

NCT00728481
View directory record Official record
Conditions
Eosinophilic Esophagitis, Gastroesophageal Reflux Disease, EE, GERD
Interventions
Esomeprazole, Budesonide
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 14, 2016 · Synced Oct 5, 2026, 6:59 AM EDT
Terminated Not applicable Interventional Results available

Effect of Acid Suppression Medication on Pediatric Microbiome

NCT02016820
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
Omeprazole (suspension), Lifestyle Modification
Drug · Other
Lead sponsor
Columbia University
Other
Eligibility
0 Years to 4 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 26, 2023 · Synced Oct 5, 2026, 6:59 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 5, 2026, 6:59 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 Aug 1, 2025 · Synced Oct 5, 2026, 6:59 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of a Proton Pump Inhibitor on Gleevec® in Healthy Volunteers

NCT00446004
View directory record Official record
Conditions
Healthy
Interventions
Imatinib Mesylate, Omeprazole
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 65 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 22, 2016 · Synced Oct 5, 2026, 6:59 AM EDT