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Getting the latest healthcare news for you
Getting the latest healthcare news for you
Medications you stopped taking years ago could still be altering your gut bacteria. A study of 2,500+ people found lasting microbiome changes tied to antibiotics, antidepressants, beta-blockers, proton pump inhibitors, and benzodiazepines — with some effects detectable years after the last dose. Researchers say medication history deserves far more attention in microbiome science.
Medications you stopped taking years ago may still be leaving a mark on your gut. A large study led by researchers at the University of Tartu Institute of Genomics found that common drugs — including antidepressants, beta-blockers, proton pump inhibitors (PPIs), and benzodiazepines — are associated with lasting changes to the gut microbiome, sometimes detectable years after the prescription ended. The findings challenge the common assumption that only current medications matter when studying gut health.
One standout finding: benzodiazepines (used for anxiety) showed microbiome disruptions comparable to broad-spectrum antibiotics. The study also revealed that drugs within the same class don't always affect gut bacteria the same way — for example, diazepam and alprazolam differed meaningfully in their microbial impact, suggesting individual drugs need to be evaluated separately rather than lumped by category.
Key Takeaways:
Why it matters: The gut microbiome influences digestion, immunity, and metabolism — and it's increasingly linked to disease risk. If past drug use leaves lasting microbial "fingerprints," clinicians and researchers may be misattributing microbiome changes to disease when medications are actually the culprit.
