New hope for MS muscle stiffness: phase 3 drug trial launches
NCT ID NCT05179577
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tests an extended-release tablet called arbaclofen to see if it safely reduces muscle stiffness (spasticity) in people with multiple sclerosis. About 442 adults aged 18 to 65 with MS-related spasticity will receive either the drug or a placebo. The goal is to measure changes in muscle tightness and overall function.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 3
Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.
- Participants
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About 442 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jan 2027
An estimate. Start dates often move.
- Expected to finish
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Apr 2028
An estimate. End dates often move.
- Lead sponsor
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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
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18 to 65 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: * Subjects 18 to 65 years of age, inclusive * An established diagnosis per McDonald Criteria (Polman et al 2011) of MS (either RR or SP course) that manifests a documented history of spasticity for at least 6 months prior to screening * Spasticity due to MS as shown by a TNmAS-MAL score ≥ 2 * Expanded Disability Status Scale (EDSS) score greater than or equal to (≥) 3.0 and less than or equal to (≤) 7.0 * Absence of infections, peripheral vascular disease, painful contractures, advanced arthritis, or other conditions that hinder evaluation of joint movement * Use of a medically highly effective form of birth control (see Section 7.8) during the study and for 3 months thereafter for women of child-bearing potential (including female subjects and female partners of non-sterile male subjects) * Willing to sign the informed consent form (ICF) Exclusion Criteria: * Any concomitant disease or disorder that has symptoms of spasticity or that may influence the subject's level of spasticity * In the opinion of the investigator, the patient is unable to rate their level of spasticity or distinguish it from other MS symptoms * Concomitant use of medications that would potentially interfere with the actions of the study medication or outcome variables * Pregnancy, lactation, or planned pregnancy during the course of the study and for 3 months after the final study visit * Current significant cognitive deficit, severe or untreated anxiety, severe or untreated depression * Current malignancy or history of malignancy that has not been in remission for more than 5 years, except effectively treated basal cell skin carcinoma * Any other significant disease, disorder, or significant laboratory finding which, in the opinion of the investigator, puts the subject at risk because of participation, influences the result of the study, or affects the subject's ability to participate
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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 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.
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Other studies related to the condition(s) this trial covers.
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