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Could a diabetes drug tame fragile x symptoms?

NCT ID NCT05120505

Disease control Sponsor: Children's Hospital of Fudan University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Aug 25, 2026 · Last updated Aug 26, 2026 · Updated 1 time

Summary

This trial tests whether metformin, a common diabetes medication, can improve behavior, thinking, and language in children with fragile X syndrome. Children aged 2 to 16 will receive either metformin or a placebo for six months. Researchers will measure changes in behavior using a standard checklist to see if the drug helps.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Metformin, a common diabetes drug, given as an oral tablet
What this could lead to
If effective, metformin could become a new treatment to reduce behavioral and cognitive challenges in children with fragile X syndrome.
What could go wrong
This is a small, early-stage trial, and metformin may not improve symptoms. Possible side effects include stomach upset and, rarely, lactic acidosis.

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

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

37 people

The number who actually took part.

Started

Dec 2021

Finished

Jan 2025

Lead sponsor

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

2 to 16 years

Sex

Anyone

Healthy volunteers

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

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Genetic testing confirms the diagnosis of FXS * Participate in the study with the informed consent of the guardian * BMI\>the 3rd percentile * Not taking more than 2 therapeutic drugs * Able to receive regular follow-up visits Exclusion Criteria: * Malnutrition * Primary heart disease * Severe infection or acute clinical illness * Gastrointestinal, renal, or hepatic disease * Previous history of lactic acidosis * previous use of metformin intolerant * Use of angiotensin converting enzyme inhibitors, use of anticoagulants, vitamin B12 deficiency, alcohol consumption * Unstable systemic diseases other than FXS * Changes in clinical medication

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Conditions

The condition(s) this trial relates to.

fragile X syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Fragile X syndrome Metformin

Contacts and locations

Locations

  • Children's Hospital of Fudan University

    Shanghai, Shanghai Municipality, 201102, China

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