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Allergy pill shows promise for MS repair in small trial

NCT ID NCT05359653

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jul 02, 2026 · Updated 1 time

Summary

This study tests whether clemastine fumarate, a common allergy medicine, can help repair the protective coating around nerves (myelin) in people with multiple sclerosis. About 74 adults with relapsing-remitting MS will receive either the drug or a placebo, and advanced MRI scans will measure changes in myelin over six months. The goal is to see if this cheap, safe drug can become a first-ever repair therapy for MS.

What this could mean

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

Active substance
clemastine fumarate (an over-the-counter allergy medicine)
What this could lead to
If it works, this could point toward a treatment that repairs damaged nerve insulation in multiple sclerosis, potentially slowing or reversing some disability.
What could go wrong
This is an early-phase trial with only 74 participants, so results may not apply to all MS patients. The drug is being tested for a new use, and it may not show clear benefit on MRI scans.

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 1/2

Runs two stages together: safety and dose first, then whether the treatment works.

Participants

About 74 people

The number the study aims to enrol. It can still change while the study runs.

Started

Aug 2023

Expected to finish

Jun 2027

An estimate. End dates often move.

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

18 to 55 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: * Written informed consent must be obtained prior to any assessment being performed. * Patients diagnosed with relapsing remitting multiple sclerosis and a disease duration of \< 15 years * Male or female patients aged 18-55 years (inclusive) * Use of appropriate contraception during period of trial (women). Before entry women must be: * Post-menopausal for at least 1 year OR * Surgically sterile (have had a hysterectomy or bilateral oophorectomy, tubal ligation, male partner vasectomy or otherwise incapable of pregnancy) OR * Practicing a highly effective method of birth control if sexually active, including hormonal prescription oral contraceptives, contraceptive injections, contraceptive patch, intrauterine device, double barrier method (e.g., condoms, diaphragm or cervical cap with spermicidal foam, cream or gel), or male partner sterilization consistent with local regulations regarding use of birth control methods for patients participating in clinical trials, for the duration of their participation in the study OR * Not heterosexually active (patients who are not heterosexually active at screening must agree to utilize a highly effective method of birth control if they become heterosexually active during their participation in the study) OR * Practicing true abstinence (when this is in line with the preferred and usual lifestyle of the subject) Period abstinence (e.g., calendar, ovulation, symptothermal, post ovulation methods) is not an acceptable method. Exclusion Criteria: * Radiologic identification of marked brain atrophy relative to patients age based on recent MRI and interpretation of expert neuroradiologist or PI * New lesion in most recent MRI (within 3 months) * Hypersensitivity to clemastine or other arylalkylamine antihistamines, or any of the excipients. * Treatment with corticosteroids within 30 days prior to screening. * Expanded Disability Status Scale (EDSS) ≥ 4.5 * History of significant cardiac conduction block. * History of cancer. * Suicidal ideation or behavior in 6 months prior to baseline. * Pregnancy, breastfeeding or planning to become pregnant. * Involved with other study protocols simultaneously without prior approval. * Concomitant use of any other putative remyelinating therapy as determined by the investigator. * Prior treatment with total lymphoid irradiation, T cell or T cell receptor vaccination. * Prior treatment with alemtuzumab, mitoxantrone, or cyclophosphamide. * Serum creatinine \> 1.5 mg/dL; aspartate transaminase (AST), alanine transaminase (ALT), or alkaline phosphatase \> 2 times the upper limit of normal. (Reported within 72 hours) * History of drug or alcohol abuse within the past year. * Untreated B12 deficiency (as determined by B12 serological assessments and metabolites including methylmalonic acid \[MMA\] and homocysteine) or untreated hypothyroidism. * Clinically significant cardiac, metabolic, hematologic, hepatic, immunologic, urologic, endocrinologic, neurologic, pulmonary, psychiatric, dermatologic, allergic, renal, or other major diseases that in the PI's judgment may affect the interpretation of study results or patient safety. * History of or presence of clinically significant medical illness or laboratory abnormality that, in the opinion of the investigator would preclude participation in the study * Inability to participate in MRI, including extreme claustrophobia. * Any dental braces or permanent or undetachable metals in the jaw or face.

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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.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. 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

  • Sandler Neurosciences Building, Neurological Clinical Research Unit

    RECRUITING

    San Francisco, California, 94107, United States

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