Clinical trial Recruiting at 1 site Interventional Ages 18 and up

Breath testing for small intestinal bacterial overgrowth after proton pump inhibitors

Official title: Breath Testing for Small Intestinal Bacterial Overgrowth in Patients Treated With Proton Pump Inhibitors

Run by Mayo Clinic · NCT05976165 · Data updated 2026-11-12

This study is testing if people with gastroesophageal reflux symptoms who have taken proton pump inhibitors have a higher chance of having small intestinal bacterial overgrowth by using breath tests.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment50 (estimated)
SponsorMayo Clinic
Academic / other
Locations1 site (Jacksonville, Florida)
StatusRecruiting
StartedNovember 17, 2023
Main results expectedJanuary 1, 2027
Study endsJanuary 31, 2027
Registry record updatedFebruary 12, 2026
Trial IDNCT05976165 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are individuals experiencing predominant symptoms of gastroesophageal reflux disease, such as heartburn and regurgitation, who have not used PPIs or H2R-antagonists in the past three months.

Probably not a fit

Patients with a prior diagnosis of SIBO, major concomitant illnesses, or those who have undergone gastrointestinal surgery may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study aims to investigate the prevalence of small intestinal bacterial overgrowth (SIBO) in patients experiencing gastroesophageal reflux symptoms who have been treated with proton pump inhibitors (PPIs). Participants will undergo breath testing to assess the presence of SIBO following their PPI treatment. The study seeks to provide insights into the relationship between PPI use and the occurrence of SIBO, which may have implications for managing gastroesophageal reflux disease. By understanding this connection, researchers hope to improve treatment strategies for affected patients.

Why it matters

Potential benefit: If successful, this study could lead to better management of gastroesophageal reflux disease by identifying and addressing SIBO in patients treated with PPIs.

How similar studies have gone: While the relationship between PPIs and SIBO is being explored, this specific approach of breath testing in this context is relatively novel and has not been extensively tested in prior studies.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion criteria:

* Predominant symptoms of gastroesophageal reflux disease including heartburn, regurgitation
* Subjects must be able to give appropriate informed consent

Exclusion criteria:

* Prior diagnosis of SIBO
* Use of PPIs or H2R-anatagonstists in the prior 3 months
* Major concomitant illness (renal, hepatic, rheumatologic or cardiovascular disease, or malignancy)
* Antibiotic therapy within one month
* Prior gastrointestinal surgery including esophageal, gastric, and small or large bowel surgery
* Previously diagnosed irritable bowel syndrome or inflammatory bowel disease
* Individuals who are pregnant or breast feeding
* Patients with plans to become pregnant
* Inability to take PPIs, including allergy/sensitivity

Where it's running

  • Mayo Clinic Florida
    Jacksonville, Florida, United States
    Recruiting

Study contacts

  • Principal investigator: Andree Koop, MD — Mayo Clinic

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.