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MS drug interaction study: will common meds change tolebrutinib levels?

NCT ID NCT06064539

Knowledge-focused Sponsor: Sanofi 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This completed Phase 1 study tested how two common drugs—gemfibrozil (for cholesterol) and rifampicin (an antibiotic)—affect the levels of tolebrutinib, an experimental oral drug for multiple sclerosis. Thirty healthy men aged 18 to 45 took tolebrutinib alone and then with each other drug. The goal was to see if these interactions require dose adjustments, not to test tolebrutinib's effectiveness or safety in MS patients.

What this could mean

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

Active substance
Tolebrutinib (SAR442168)
What this could lead to
If successful, this study could help doctors understand how to adjust tolebrutinib dosing when taken with other common drugs.
What could go wrong
This is a very early, small study in healthy volunteers, not people with MS. It only looks at drug levels, not whether the drug works or is safe long-term.

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 1

The first testing in people. Mainly checks safety and dose, usually in a small group.

Participants

30 people

The number who actually took part.

Started

May 2020

Finished

Jul 2020

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 45 years

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Male participant, between 18 and 45 years of age, inclusive. * Body weight between 50.0 and 100.0 kg, inclusive, body mass index (BMI) between 18.0 and 30.0 kg/m2, inclusive. * Having given written informed consent prior to undertaking any study-related procedure. Exclusion Criteria: * Any history or presence of clinically relevant cardiovascular, pulmonary, gastrointestinal, hepatic, renal, metabolic, hematological, neurological, osteomuscular, articular, psychiatric, systemic, ocular, or infectious disease, or signs of acute illness. * Presence or history of drug hypersensitivity, or allergic disease diagnosed and treated by a physician. Participants with known hypersensitivity to any component of the IMP formulation or allergic disease diagnosed and treated by a physician. * Any medication (including St John's Wort and ginseng) within 14 days before inclusion or within 5 times the elimination half-life or pharmacodynamic half-life of the medication, any vaccination within the last 28 days and any biologics (antibody or its derivatives) given within 4 months before inclusion. * Any contraindications to gemfibrozil or rifampicin, according to the applicable labelling. * Any subject who, in the judgment of the Investigator, is likely to be noncompliant during the study, or unable to cooperate because of a language problem or poor mental development. The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

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Conditions

The condition(s) this trial relates to.

multiple sclerosis

As listed by the trial registrant

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

Multiple sclerosis

Contacts and locations

Locations

  • Prism Research-Site Number:8400001

    Saint Paul, Minnesota, 55144, United States

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