Clemastine treatment for individuals with Williams syndrome

Clemastine Treatment in Individuals With Williams Syndrome- a Double-blind Placebo Control to Assess the Safety and Efficacy

Phase 3 Interventional Sheba Medical Center · NCT06087757

This study is testing if the medication Clemastine can help improve thinking, movement, and behavior in young people with Williams syndrome.

Quick facts

PhasePhase 3
Study typeInterventional
Enrollment30 (estimated)
Ages6 Years to 30 Years
SexAll
SponsorSheba Medical Center Government
Locations2 sites (Ramat-Gan and 1 other locations)
Trial IDNCT06087757 on ClinicalTrials.gov

What this trial studies

This study investigates the neurobiological aspects of Williams syndrome and evaluates the potential of Clemastine as a treatment for cognitive, motor, and behavioral deficits associated with the condition. Participants aged 6 to 30 with confirmed Williams syndrome will receive Clemastine in an age-dependent dosage, followed by a randomized, double-blind, placebo-controlled phase after initial treatment. The study aims to assess the safety and effectiveness of Clemastine in improving neurocognitive outcomes in this population.

Who should consider this trial

Good fit: Ideal candidates are individuals aged 6 to 30 with a confirmed diagnosis of Williams syndrome.

Not a fit: Patients with other genetic disorders or those outside the age range of 6 to 30 years may not benefit from this study.

Why it matters

Potential benefit: If successful, this treatment could significantly improve cognitive and behavioral functioning in individuals with Williams syndrome.

How similar studies have performed: While there is limited research specifically on Clemastine for Williams syndrome, similar approaches targeting cognitive deficits in genetic disorders have shown promise.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Individuals with Williams syndrome, which has been confirmed by genetic testing.
* Ages 6-30.
* Normal values in safety variables (e.g. Normal ECG 120-129/80-84).
* No change in psychotropic medications and dosage during the last 4 weeks.
* During the study, no pharmacological change that may impact the study (e.g. ADHD
* medications).

Exclusion Criteria:

* Individuals with another genetic disorder besides Williams syndrome.
* Individuals with Williams syndrome, younger than 6 or older than 30 years old.
* Significant change in normal values in safety variables (e.g. high or low ECG).
* Change in medications and dosage during the last 4 weeks prior the beginning and
* during the study.
* Pregnancy.
* Using addictive substances such as alcohol.

Where this trial is running

Ramat-Gan and 1 other locations

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Williams SyndromeClemastineCognitionMyelination abnormalities
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.