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TerminatedNCT00542347Updated Jul 20, 2018

Comparison of the Gastric Acid Suppressive Effects of Esomeprazole and Generic Omeprazole

A Phase 3 interventional study of Esomeprazole first and Generic omeprazole first in Gastric Acid, sponsored by Queen's University. Terminated at 1 site in Canada. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2018-07-20.

Sponsored by Queen's University · Phase 3, Interventional, and Treatment

Why this study was terminated
Enrollment target not met due to high number of disqualified studies.
Phase
Phase 3
Study type
Interventional
Enrollment
20
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

Proton pump inhibitors (PPI) are used to decrease stomach acid secretion. A generic form of omeprazole, one of the PPIs, is on the market. With cheaper than brand name PPIs, it is unclear whether generic omeprazole is as effective clinically. This study compares generic omeprazole with half-dose esomeprazole, the strongest brand name PPI. The half-dose esomeprazole is in fact cheaper than generic omeprazole. Healthy volunteers will take each medication in turn for 7 days and their stomach acid will be measured while taking each medication. We hypothesize that half-dose esomeprazole is better at suppressing stomach acid than generic omeprazole.

02

Conditions studied

  • Gastric Acid

Keywords

  • gastric acid
  • proton pump inhibitors
  • omeprazole
  • esomeprazole
03

In context

Lead sponsor

Queen's University is the lead sponsor of 199 studies on the registry; 16 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • healthy, non-smoking volunteers older than 18 years of age

Exclusion criteria

Exclusion Criteria:

  • history of gastrointestinal disease
  • known infection
  • previous eradication of Helicobacter pylori
  • any prescription or over the counter antacid medication
  • pregnant and lactating women
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Crossover assignment
Masking
None (open label)
Enrollment
20 participants (actual)

Study arms

  • Active comparator
    1

    * esomeprazole 20mg po once per day for 7 days * 24hr pH study on day 7 * followed by washout for 7 days * generic omeprazole 20mg po once per day for 7 days * 24hr pH study on day 7

    Drug: Esomeprazole first

  • Active comparator
    2

    * generic omeprazole 20mg po once per day for 7 days * 24hr pH study on day 7 * followed by washout for 7 days * esomeprazole 20mg po once per day for 7 days * 24hr pH study on day 7

    Drug: Generic omeprazole first

Interventions

  • DrugEsomeprazole first

    * esomeprazole 20mg po once per day for 7 days * 24hr pH study on day 7 * followed by washout for 7 days * generic omeprazole 20mg po once per day for 7 days * 24hr pH study on day 7

  • DrugGeneric omeprazole first

    * generic omeprazole 20mg po once per day for 7 days * 24hr pH study on day 7 * followed by washout for 7 days * esomeprazole 20mg po once per day for 7 days * 24hr pH study on day 7

06

What researchers measure

Primary outcomes

  1. Median intragastric pH and percentage of time that intragastric pH is above 4

    Time frame: 24 hours

Secondary outcomes

  1. Nocturnal acid breakthrough, defined as at least 60 continuous minutes of intragastric pH below 4 occurring between 10pm and 6 am and adverse events

    Time frame: 24 hours

07

Study locations

1 site
  • Hotel Dieu Hospital
    Kingston, Ontario K7L 5G2, Canada
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 20, 2018, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT00542347
Lead sponsor
Queen's University
Collaborators
Canadian Institutes of Health Research (CIHR)
Responsible party
Dr. Adriana Lazarescu (GI Fellow, Queen's University) — Principal investigator
First posted
Oct 11, 2007
Start date
Sep 2007
Primary completion
Apr 2017
Completion
Jul 2018
Last update
Jul 20, 2018

Study contacts

William G Paterson, MD
principal investigator · Queen's University, Hotel Dieu Hospital
Adriana Lazarescu, MD
principal investigator · Hotel Dieu Hospital

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

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This study is terminated, as verified in Jul 2018. You cannot join it, but the record below documents what was studied.

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