Can a probiotic stop UTIs from coming back?
NCT ID NCT03366077
First seen Jun 24, 2026 · Last updated Jun 26, 2026 · Updated 1 time
Summary
This study tested whether taking a probiotic called Lactobacillus reuteri could reduce the number of repeat urinary tract infections (UTIs) in adult women who had recently finished antibiotic treatment for a UTI. 140 women with a history of recurrent UTIs took either the probiotic or a placebo daily for six months. Researchers tracked how many confirmed UTIs occurred during that time to see if the probiotic helped prevent them.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- probiotic (Lactobacillus reuteri)
- What this could lead to
- If it works, this could offer a natural way to help prevent repeat UTIs without relying on antibiotics.
- What could go wrong
- This is a small, completed study with 140 women, and probiotics may not work for everyone. Results may not apply to all women or different probiotic strains.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Clinical Trial Consultants AB
Uppsala, 752 37, Sweden