Study on Hydrotalcite for Relief of Acid Symptoms Due to Acid Rebound After Stopping Long-Term PPI Therapy

What this study involves

The registry says this study is recruiting. Individual locations may have different availability.

Study type

Observational

Phase

Not applicable / not listed

Age range

18 years - Not specified

Sex eligible

All sexes

Healthy volunteers

Not accepted

Participants

167 Estimated

These are starting points, not an eligibility decision. The research team must review the full requirements.

About the research

This observational study aims to explore the effectiveness of hydrotalcite, marketed as Talcid, in alleviating acid-related symptoms that occur due to an acid rebound after discontinuing a non-/no-longer-indicated long-term proton pump inhibitor (PPI) therapy. PPIs are commonly prescribed to reduce stomach acid to alleviate symptoms such as heartburn and for the treatment of, for example, duodenal and stomach ulcers. Discontinuation after prolonged use can lead to a rebound effect where dyspeptic complaints such as heartburn occur once the medication is stopped. This study is conducted in Germany and involves adult participants who have stopped using non-/no-longer-indicated PPIs and are experiencing these rebound symptoms.

Hydrotalcite is recommended by physicians as an on-demand treatment for managing acid-related symptoms. The study seeks to gather real-world evidence on its effectiveness, consumer experience, and acceptance to support claims about its use to relieve acid related symptoms due to an acid rebound. Participants will use hydrotalcite as needed (on demand when symptoms occur) over a four-week period, and will record information about symptom relief, the time it takes for relief to occur, and overall satisfaction with the treatment. Additionally, their doctors rate the suitability, tolerability, and effectiveness of the treatment.

The primary objective of the study is to assess the effectiveness of hydrotalcite by the number and percentage of patients not having used PPIs during the study period. Secondary objectives include evaluating relief from specific symptoms (heartburn, reflux, epigastric pain, feeling of fullness, and nausea, as well as improvements in quality of life due to hydrotalcite treatment. The study will also assess participants' satisfaction with hydrotalcite as an on-demand treatment and its suitability for managing these symptoms.

Participants will be adults aged 18 and older who have discontinued a long-term PPI therapy (≥8 weeks) for which there is no current indication according to indication and guidelines and who are experiencing acid rebound symptoms after stopping the PPI therapy. The study will exclude individuals with endoscopically diagnosed gastroesophageal reflux disease (GERD) (LA grade C/ D esophagitis) or those with hydrotalcite contraindications or warnings, such as pregnancy, severe renal impairment, or allergies to its ingredients.

Data will be collected through standardized questionnaires completed by participants after they consent to join the study. The study aims to enroll approximately 167 participants, anticipating a 40% drop-out rate, to ensure around 100 completed questionnaires. Statistical analyses will be exploratory and descriptive, focusing on categorical and continuous variables.

The study is designed to be observational, meaning there will be no direct intervention or randomization of participants. Instead, it will collect primary data directly from participants and investigators across approximately twenty sites in Germany. The results will provide valuable insights into the effectiveness of hydrotalcite in managing acid rebound symptoms and may inform future treatment recommendations for participants discontinuing long-term PPI therapy.

Who may be able to participate?

The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.

Eligibility Criteria:

Adult female or male subjects aged ≥ 18

• Subjects who have discontinued daily PPI therapy (≥ 8 weeks of therapy) for which there is no current indication according to guidelines and approval status, e.g.

• irritable bowel syndrome
• subjects who receive Non-Steroidal Anti-Inflammatory drug (NSAID) treatment with no warning signals\* regarding ulcers
• polymedication\*\* with no warning signals\* or side effects regarding ulcers
• unclarified upper abdominal discomfort
• mild forms of GERD; like Non-Erosive Reflux Disease (NERD), Los Angeles (LA) grade A/B esophagitis
• Suffer from acid-rebound due to a discontinuation of a non/no longer indicated long-term PPI therapy (≥ 8 weeks of therapy)
• No endoscopically diagnosed GERD\*\*\*
• No indication for a PPI-therapy according to guidelines.

Examples for guideline recommendations for a PPI-therapy:

• moderate - severe forms of reflux esophagitis
• gastric ulcer, duodenal ulcer
• Helicobacter pylori eradication
• moderate/severe forms of GERD - Los Angeles (LA) grade C/D esophagitis
• Zollinger-Ellison-Syndrome

No Talcid® contraindications or warnings as:

• pregnancy and lactation
• severe renal impairment
• hypophosphatemia
• existing myasthenia gravis
• impaired renal function
• Alzheimer's disease or other forms of dementia
• patients under low-phosphate diet
• hypersensitivity to the ingredients of Talcid®

• Subjects who voluntarily agree to use Talcid® Chewable Tablets for relief of acid-related symptoms due to acid-rebound
• Decision to initiate on-demand treatment of acid-related symptoms due to acid-rebound with Talcid® was made as per investigator's routine recommendation practice and by the subject
• Subject purchases Talcid® for her/his own use
• Signed informed consent
• No participation in an investigational program with interventions outside of routine clinical practice
• No contraindications according to the local marketing authorization

\* Warning signals:
* Age \> 60 (with one additional warning signal)
* Previous history or family history of ulcers
* Helicobacter pylori positive status \*\* Polymedication: defined as at least five medicinal products at the same time for a continuous therapy \*\*\* Endoscopy: LA grade C/ D esophagitis, Barrett esophagus, peptic stricture; pH- Impedance measurement: acid exposure \> 6%

Exclusion Criteria: not applicable

Study population

Adult subjects aged 18 years and older for whom there is not/no longer an indication for a daily PPI therapy according to approval status and guidelines, and who suffer from acid related symptoms due to an acid rebound after discontinuation of a non/no longer indicated long-term PPI-therapy (≥8 weeks).

Treatment, groups and participation

The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.

Assignment

Not reported

Masking

Not reported

What researchers are measuring

Outcome measures describe what is being studied. They are not proof that a treatment works.

Primary measures

Secondary measures

Research locations (1)

The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.

1 locations

Study team and timeline

Lead sponsor

Bayer

Study start

Nov 18, 2025 Actual

Primary completion

Oct 31, 2027 Estimated

Study completion

Oct 31, 2027 Estimated

First posted

Dec 18, 2025 Actual

Last updated

Nov 10, 2026 Actual

Official study contacts