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Antibiotics Alter Gut Health for Years, Study Finds

3/20/2026

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Story summary
  • Antibiotic use significantly alters gut microbiome composition for four to eight years, according to a Uppsala University study in Sweden.
  • The analysis used data from nearly 15,000 adults and found clindamycin and fluoroquinolones had the strongest effects, while penicillin V had minimal impact.
  • The findings urge careful antibiotic prescribing to mitigate long-term risks, including obesity and type 2 diabetes, and to favor treatments less disruptive to gut health.