Common Medications May Leave Lasting Gut Changes, Study Finds
Your gut may remember medicines you stopped taking years ago. A new study found that many drugs can cause lasting gut changes. Researchers linked these effects to medications beyond antibiotics. As a result, scientists may need to rethink microbiome research. The study came from the University of Tartu Institute of Genomics. Researchers analyzed health records and stool samples from 2,509 people in Estonia. They studied 186 prescription drugs and found that 167 affected gut microbes in some way. In addition, 78 drugs showed long-term effects that lasted years after treatment ended.
Researchers Find Long-Term Gut Effects
Scientists discovered that several common drugs changed gut bacteria for years. These included antidepressants, beta blockers, proton pump inhibitors, and benzodiazepines. Surprisingly, some effects stayed visible more than three years later. Lead researcher Dr. Oliver Aasmets said past medication use matters as much as current treatment. Therefore, future microbiome studies may need to review older prescriptions too. Researchers also noticed stronger effects in people who used medications repeatedly. For example, frequent prescriptions often caused bigger microbial shifts. Benzodiazepines showed especially strong changes that matched the impact of broad-spectrum antibiotics.
Why These Findings Matter
The team also tracked 328 participants over several years. Follow-up samples confirmed that starting or stopping drugs changed gut bacteria in predictable ways. In addition, scientists found that similar drugs did not always affect the microbiome equally. For example, alprazolam and diazepam produced different microbial effects. That finding may help doctors choose treatments with fewer gut-related impacts in the future. Corresponding author Professor Elin Org said medication history could improve microbiome research accuracy. However, researchers warned people not to stop prescribed medicines without medical advice. The study had some limits. Researchers only examined prescription medications. They also relied on prescription records instead of confirmed drug use.
