Could a common antibiotic help fight MS by changing gut bacteria?
NCT ID NCT05539729
First seen Jun 26, 2026 · Last updated Jun 26, 2026 · Updated 1 time
Summary
This study is testing whether the antibiotic vancomycin can change the gut bacteria and immune system of people with newly diagnosed multiple sclerosis (MS). The researchers will give vancomycin or a placebo to 12 people and measure changes in gut bacteria, blood markers, and brain scans. The goal is to understand how gut bacteria might affect MS, not to find a treatment yet.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- vancomycin
- What this could lead to
- If it works, this could point toward a way to treat MS by targeting gut bacteria.
- What could go wrong
- This is a very small, early-phase study with only 12 people. It is designed to test a theory, not to prove a treatment works.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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About 12 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jan 2023
- Expected to finish
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Sep 2026
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 50 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * aged 18 - 50 * newly diagnosed MS (2017 McDonald criteria), CIS or RIS patients, who have experienced symptoms no earlier than the past year * treatment naive * able to understand the risks, benefits, and alternatives of participation and give meaningful consent Exclusion Criteria: * antibiotic use within the past 90 days; * pre- or probiotic use within past month or corticosteroids use within the past month; * use of tobacco products within the past 1 month; * history of treatment with immunosuppressants; * history of gastroenteritis within the past month or diagnosis with a chronic infectious disease, i.e. hepatitis B, C or HIV; * pregnancy or less than 6 months postpartum; * irritable bowel syndrome and other bowel dysfunction such as constipation; * history of bowel surgery; * inflammatory bowel disease, rheumatoid arthritis, systemic lupus erythematosus, diabetes and any other auto-immune illness; * diagnosis with another neurological disease, behavioral or psychiatric conditions that would be incompatible with a safe and successful participation in the study (such as severe major depression, schizophrenia and presence of psychotic symptoms); * eating disorders such as anorexia nervosa, bulimia, or binge eating syndrome; * travel outside of the country within the past month; * contraindication to vancomycin including estimated glomerular filtration rate of \<60ml/min, impaired hearing or known allergy. * Contraindication to MRI such as implanted metallic objects
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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.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Corinne Goldsmith Dickinson Center for Multiple Sclerosis at Mount Sinai
RECRUITINGNew York, New York, 10029, United States
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