Psychiatrist.comProton Pump Inhibitors and the Risk of Dementia

ℹ️ Observational Association Only Evidence

Across roughly 20 observational studies pooled in multiple meta-analyses, older adults who initiated and continued PPIs showed elevated dementia and MCI risk. High statistical heterogeneity (I² often 99%) and residual confounding prevent causal interpretation.

Clinical Considerations

• The risk signal concentrates in chronic users; baseline assignment alone shows no consistent association with dementia incidence
• Proposed mechanisms include vitamin B12, iron, and magnesium deficiency, gut microbiome disruption, and altered amyloid metabolism
• UK Biobank data show elevated risk in women and adults 65+, but not in those with established dementia risk factors
• Long-term PPI use also carries fracture, microbiome, and CYP2C19-mediated drug interaction risks beyond cognitive concerns

Practice Applications

• Interpret PPI exposure as a dementia risk marker, not an established cause
• Consider deprescribing PPIs when ongoing indication is unclear, especially in older patients
• Monitor cognitive status in older patients on long-term PPI therapy
• Avoid omeprazole in patients on clopidogrel; prefer pantoprazole for fewer interactions

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