Evidence-backed FAQ
What does research show about probiotics taken with antibiotics?
Direct answer
In pooled randomized trials of adults, probiotics taken alongside antibiotics were associated with about a 37–38% lower risk of antibiotic-associated diarrhea. The effect varied by strain, dose, timing, and baseline risk.[1], [2]
What the evidence shows
Two 2021 meta-analyses included thousands of adults. Pooled adverse-event data did not show a statistically significant increase compared with placebo.[1], [2]
Important limitations
The evidence was graded moderate quality, optimal dose and duration remain undefined, and the findings do not establish safety for immunocompromised or critically ill people.[1], [2]
Related questions
- Do all strains have the same evidence?
- Did probiotics increase adverse events?
Read the full evidence summary
This FAQ is the concise answer. The linked research page provides the full study context, populations, doses, outcomes, and limitations.
References
- Probiotics for the prevention of antibiotic-associated diarrhoea: a systematic review and meta-analysis.. BMJ open. 2021. Systematic review and meta-analysis View source →
- Probiotics for the Prevention of Antibiotic-associated Diarrhea in Adults: A Meta-Analysis of Randomized Placebo-Controlled Trials.. Journal of clinical gastroenterology. 2021. Systematic review and meta-analysis View source →