Clinical Trial of Mexiletine Hydrochloride for Spinal and Bulbar Muscular Atrophy

Recruiting now · Phase 2/Phase 3 · Has a placebo group

Conditions studied: Spinal and Bulbar Muscular Atrophy

In brief

The purpose of this clinical trial is to evaluate the efficacy and safety of mexiletine hydrochloride in patients with spinal and bulbar muscular atrophy. The main questions it aims to answer are: Does mexiletine hydrochloride improve the ALSFRS-R score in spinal and bulbar muscular atrophy patients? Participants will: Take mexiletine hydrochloride or a placebo every day for 3 months Visit the hospital once every 4 weeks for evaluations.

Key facts

Study ID: NCT06862596
Run by: Masahisa Katsuno
People needed: 68
Starts: 2025-02-28
Expected to finish: 2027-12-31
Last updated by the study team: 2025-04-16

Who can join

Age: 18 and older, up to 80. Sex: male. Healthy volunteers: not accepted.

You may qualify if…

Male patients with a CAG repeat count of 38 or more for the androgen receptor gene in genetic testing and a confirmed diagnosis of SBMA
Patients with muscle weakness (limb weakness and atrophy, or bulbar palsy) due to lower motor neuron lesion
Patients with a total ALSFRS-R score of ≥ 24 and ≤ 42 at screening
Patients who are at least 18 years old and less than 80 years old at the time of consent
Patients who give their voluntary written consent after having received adequate information on this study (However, if the patient is unable to sign the consent form due to the condition of the disease, a person equivalent to a regal representative must be present to provide written explanation, the prospective candidate must verbally consent to participate in the study, and a person equivalent to a regal representative must sign the consent form on behalf of the patient. The person who is to be the regal representative may sign the document on his/her behalf, noting the circumstances and his/her relationship to the subject.)

You may not qualify if…

Patients who have participated or are participating in a clinical trial within 12 weeks prior to enrollment
Patients with a history of hypersensitivity to any component of this drug product
Patients with a conduction disturbance (such as second- or third-degree atrioventricular block without a pacemaker, or left bundle branch block)
Patients with Brugada-type ECG
Patients with severe heart failure or heart disease (myocardial infarction, valvular disease, cardiomyopathy, etc.)
Patients with sinus bradycardia (<50 beats/minute)
Patients with systolic blood pressure of 90 mmHg or less
Patients with serum potassium level less than 3.5 mmol/L
Patients on antiarrhythmic drugs
Patients on antiepileptic drugs that affect to sodium channels
Patients on theophylline
Patients on narcotics
Patients who used Mexiletine within 1 month prior to enrollment or used Mexiletine for expectations of improvement in symptoms of SBMA
Patients with serious complications
Patients who cannot agree to use contraception during the study period
Other Patients deemed inappropriate by the investigator or subinvestigator

Where it is running

Tokyo University Hospital — Bunkyō City, Japan (enrolling)
Chiba University Hospital — Chiba, Japan (enrolling)
Hokkaido University Hospital — Sapporo, Japan (enrolling)
Jichi Medical University Hospital — Shimotsuke, Japan (enrolling)
Osaka University Hospital — Suita, Japan (enrolling)

Full record on ClinicalTrials.gov

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