Meta-analysisindependent cross-checkabstract checked★ key study I-PPI-113 in-depth review
Randomised trials: PPIs prevent bleeding without clear infection increase
Proton Pump Inhibitor Use for Gastroprotection and Stress Ulcer Prophylaxis Does Not Increase the Risk of Clostridioides difficile Infection or Pneumonia: A Systematic Review and Meta-Analysis of RCTs.
Overview
Omar MA et al.. J Clin Med 2026 · PMID 41976918 · DOI 10.3390/jcm15072617
In 8 randomised trials with 30,019 people, PPIs reduced serious stomach bleeding and did not significantly increase pneumonia or C. difficile.
Does the study support the specific claim? No · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Check infection risks of PPIs in RCTs.
- How was the study done?
Meta-analysis of RCTs.
- How many people, animals or samples were studied?
30,019 participants.
- What was actually found?
No significant rise in CDI or pneumonia; less bleeding.
- How large was the observed effect?
Pneumonia OR 1.00; CDI 1.29; bleeding 0.51.
- What do the results mean in everyday life?
Short-term PPI prophylaxis is relatively safe when indicated.
- What are the study's limitations?
Few trials; rare events imprecise.
- What does it say about Elawady's specific claim?
Limits claims of pneumonia; leaves CDI uncertain.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot exclude small long-term risks.
Scientific in-depth review
1. Full reference
- Authors
- Omar MA et al.
- Journal
- J Clin Med
- Year
- 2026
- Identifier
- PMID 41976918 DOI 10.3390/jcm15072617
- Verification
- verified – PubMed efetch 2026-10-26 + Crossref 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
No conflicts declared
2. Research question
Do PPIs increase C. difficile infection or pneumonia in randomised trials, and what is the effect on GI bleeding?
3. Study design and population
- Study design
- Meta-analysis – Systematic review and meta-analysis of RCTs of PPI prophylaxis (gastroprotection and stress ulcer prophylaxis)
- Population
Participants in 8 RCTs (incl. COMPASS and ICU stress-ulcer trials)
- Country
International
- Period
Search to July 2025
- Sample size
8 RCTs; 30,019 participants
- Inclusion and exclusion criteria
English-language RCTs of PPI vs placebo
4. Methods and endpoints
- Exposure / intervention
PPI prophylaxis
- Comparator
Placebo
- Endpoints
CDI, pneumonia, clinically important upper GI bleeding
- Statistical methods
Random-effects ORs; RoB 2; I2; leave-one-out
5. Actual results
- Results
CDI OR 1.29 (0.82-2.02; I2 16%); pneumonia OR 1.00 (0.92-1.09; 6 trials; I2 0%); clinically important upper GI bleeding OR 0.51 (0.27-0.94; 7 trials; I2 56%).
- Absolute risks
Not reported in abstract
- Authors' conclusion
PPI prophylaxis reduced upper GI bleeding without increasing CDI or pneumonia; larger trials needed for rare events.
6. Strengths
- RCT-only evidence avoids confounding
- RoB 2 used
7. Weaknesses
- Few trials; CDI imprecise
- Follow-up 30 days to 3 years
- Mostly ICU and COMPASS data
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Small number of trials; English only.
9. Assessment of the statistical interpretation
CDI CI compatible with no effect or a doubling; pneumonia CI excludes >9% relative increase (stats/C-PPI-05_pneumonia.py).
10. Relevance to the specific claim
Randomised evidence: no clear pneumonia increase; C. difficile signal uncertain; bleeding reduced.
11. Independent contrary findings
Observational meta-analyses show CDI OR ~1.7-2 (A-PPI-05/06).
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Limits causal certainty for infections; supports benefit for bleeding prevention.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Rare long-term infections.
15. Linked fact checks
- Long-term acid suppression causes hip fractures and pneumonia. – Studies contradicting or limiting the claim
- Long-term acid suppression increases bacterial overgrowth, Clostridioides difficile and other enteric infections, and changes the gut microbiome. – Studies contradicting or limiting the claim
- All acid-suppressing medicines (PPIs and H2 blockers) are permanently forbidden; heartburn should stop through the diet, not through drugs. – Studies contradicting or limiting the claim