Gut Changes Persist Years After Stopping Certain Medications

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Recent research shows that common medications such as antibiotics and antidepressants can leave lasting changes in gut bacteria.

The body clears medicines within hours to weeks. However, a recent study suggests that drugs you took years ago may continue to affect your gut—and the more frequently and the longer they’re used, the greater their effect.

Nearly nine out of 10 commonly used medications leave permanent changes in gut bacteria—including drugs never before linked to digestive effects, according to the study.

This holds true not only for antibiotics but also for drugs used to manage high blood pressure, anxiety, and stomach hyperacidity.

“We may be underestimating the impact of common medications on gut health,” Kara Siedman, nutritionist and director of partnerships with resbiotic Nutrition, who wasn’t involved in the research, told The Epoch Times.

Your Gut Remembers

The findings extend far beyond antibiotics, which doctors already know disrupt gut bacteria. The study showed that even medications targeting human cells—including antidepressants, beta-blockers, acid reflux medicines such as omeprazole, benzodiazepines, and metformin—reshaped the gut microbial composition.

“We often think of medications as acting only on human cells, but they also interact with the gut ecosystem—the microbes, the intestinal barrier, and the immune system,” said Siedman.

The study found that many drugs left lasting effects on the gut, still visible more than three years after people stopped taking them. To test whether the drugs themselves were responsible, the researchers tracked a smaller subgroup over time. In this group, starting a drug caused predictable gut shifts, and stopping it often reversed them, supporting a causal link.

Findings showed that common drugs had similar effects to antibiotics. Benzodiazepines, commonly prescribed for anxiety, changed the gut as much as certain broad-spectrum antibiotics by reducing microbial diversity. Antidepressants also left patterns similar to those seen with antibiotics.

Gut Microbes Affected

A common bacterial type that increases with drug exposure, such as antidepressants and beta-blockers, is the Clostridium family. Some of these bacterial species are linked to rare cases of infections in humans.

Benzodiazepines are linked to increases in Dorea formicigenerans and Ruminococcus torques. Dorea formicigenerans are linked with obesity and metabolic syndrome in some human studies, though it can also produce beneficial metabolites. Ruminococcus torques is a bacterium that breaks down the mucus in the gut lining and is linked to gut conditions such as Crohn’s disease, irritable bowel syndrome, and metabolic disorders when present in abundance.

Drugs used for the same condition didn’t always affect the gut in the same way. For instance, within benzodiazepines, alprazolam (Xanax) led to a greater loss of gut microbial diversity than diazepam (Valium).

Proton pump inhibitors are linked to increased levels of oral bacteria such as Streptococcus parasanguinis and Veillonella parvula, both linked to periodontal disease and dental cavities.

Perhaps most striking was the cumulative nature of these changes. People with a history of antibiotic use never fully regained the same gut diversity as those who had never taken them, regardless of how long ago their last course was prescribed.

Past use added up: higher doses and longer durations left stronger, longer-lasting shifts in the microbiome. This additive pattern was seen with benzodiazepines, steroids, and beta-blockers.

By Rachel Ann T. Melegrito

Read Full Article on TheEpochTimes.com

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