A Study to Evaluate the Efficacy and Safety of Cannabidiol Oral Solution (CBD-OS [GWP42003-P, JZP926]) for the Treatment of Focal-Onset Seizures

June 1, 2026 updated by: Jazz Pharmaceuticals

A Phase 1b, Multicenter, Open-Label, Single-arm Study to Evaluate the Efficacy and Safety of Cannabidiol Oral Solution (CBD-OS [GWP42003-P, JZP926]) in Participants Aged 12 to 75 Years for the Treatment of Focal-Onset Seizures

Cannabidiol oral solution (CBD-OS) is approved in the US for the treatment of seizures associated with Lennox-Gastaut syndrome (LGS), Dravet syndrome (DS), or Tuberous sclerosis complex (TSC) in patients 1 year of age and older. This study will assess the efficacy and safety of CBD-OS in participants aged 12 to 75 years for the treatment of focal-onset seizures (FOS).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This study will assess the efficacy of CBD-OS as an adjunctive treatment in reducing the frequency of focal seizures compared to baseline as well as the effect of CBD-OS on health outcome endpoints in early line and refractory participants with FOS. This study will also examine pharmacokinetics (PK), safety, and potential predictors or mediators of treatment response, including functional magnetic resonance imaging (fMRI) and neuropsychological testing in a substudy.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
100

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • Arizona
      • Phoenix, Arizona, United States, 85006
        • Not yet recruiting
        • Banner University Medical Center-Phoenix
    • California
      • La Jolla, California, United States, 92037-1300
        • Recruiting
        • UC San Diego
    • Connecticut
      • New Haven, Connecticut, United States, 06510
        • Recruiting
        • Yale University
    • Florida
      • Tampa, Florida, United States, 33606
        • Not yet recruiting
        • University of South Florida
    • Georgia
      • Atlanta, Georgia, United States, 30329
        • Recruiting
        • Emory University
      • Savannah, Georgia, United States, 31406
        • Recruiting
        • Savannah Neurology Specialists
    • Illinois
      • Chicago, Illinois, United States, 60611
        • Recruiting
        • Northwestern University
    • Maryland
      • Bethesda, Maryland, United States, 20817
        • Recruiting
        • Mid-Atlantic Epilepsy and Sleep Center
    • Michigan
      • Detroit, Michigan, United States, 48201
        • Not yet recruiting
        • Wayne State University
      • Grand Rapids, Michigan, United States, 49503
        • Not yet recruiting
        • Corewell Health
    • New Jersey
      • Edison, New Jersey, United States, 08820
        • Not yet recruiting
        • Hackensack Meridian Neuroscience Institute at JFK University Medical Center
      • New Brunswick, New Jersey, United States, 08901
        • Recruiting
        • Saint Peter's University Hospital
    • New York
      • Hawthorne, New York, United States, 10532
        • Recruiting
        • Boston Children's Health Physicians
    • North Carolina
      • Charlotte, North Carolina, United States, 28211
        • Recruiting
        • Onsite Clinical Solutions
      • Raleigh, North Carolina, United States, 27607
        • Recruiting
        • Velocity Clinical Research at Raleigh Neurology
    • Ohio
      • Cincinnati, Ohio, United States, 45229
        • Not yet recruiting
        • Cincinnati Children's Hospital
      • Cincinnati, Ohio, United States, 45267-0525
        • Recruiting
        • University of Cincinnati, Gardner Neuroscience Institute
    • Oregon
      • Portland, Oregon, United States, 97239
        • Recruiting
        • Oregon Health & Science University
    • Tennessee
      • Memphis, Tennessee, United States, 38103
        • Recruiting
        • Le Bonheur Children's Hospital
    • Texas
      • Austin, Texas, United States, 78757
        • Recruiting
        • Child Neurology & Consultants of Austin
      • El Paso, Texas, United States, 79912
        • Recruiting
        • ANESC Research
    • Utah
      • Murray, Utah, United States, 84107
        • Recruiting
        • Intermountain Health
    • Washington
      • Seattle, Washington, United States, 98105
        • Recruiting
        • Seattle Children's Hospital
    • Wisconsin
      • Madison, Wisconsin, United States, 53705
        • Not yet recruiting
        • William S Middleton Memorial Veterans Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Participants are eligible to be included in the main study only if all of the following criteria apply:

  1. Participant has a documented diagnosis of focal epilepsy according to the ILAE Classification of Epilepsy, 2017, characterized by focal seizure types with typical interictal/ictal EEG findings (eg, history of an EEG with focal sharp waves or slowing). Participants with a documented diagnosis of focal epilepsy and a normal EEG are eligible for inclusion.
  2. Participant is currently treated with at least 1, but no more than 4, antiseizure medications on a stable regimen.
  3. Participant is aged 12 to 75 years old, inclusive, at Screening.

Participants are excluded from the study if any of the following criteria apply:

  1. Has a concurrent, confirmed diagnosis of non-epileptic seizures or events that can confound the assessment of the efficacy measures, in the opinion of the investigator.
  2. Has clinically significant unstable medical condition(s), other than epilepsy.
  3. History of suicidal behavior, current suicidal risk as determined from history, or presence of active suicidal ideation as indicated by a positive response to Item 4 or Item 5 on the C-SSRS or is considered at risk of suicide or self-harm based on the clinical judgement of the investigator following interview with the participant and/or caregiver.
  4. Has known or suspected hypersensitivity to cannabinoids or any of the excipients of the study intervention, such as sesame oil.
  5. Is currently treated with Epidiolex or received treatment with Epidiolex within 28 days prior to Screening (Visit 1).
  6. Is currently using or has used recreational or medicinal cannabis, cannabinoid/CBD based medications, products, or supplements (botanical or synthetic) within 28 days prior to Screening (Visit 1) and/or is unwilling to abstain for the duration of the study.
  7. Presence of only nonmotor focal aware seizures or primary generalized epilepsies.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: CBD-OS
Participants who will receive open-label CBD-OS.
Drug: CBD-OS
Starting dose of CBD-OS will be administered as per the approved local product label
Other Names:
  • GWP42003-P
  • JZP926

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Percent change in countable focal seizure frequency compared to baseline
Time Frame: Baseline up to 16 weeks
Baseline up to 16 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Jazz Pharmaceuticals

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Jazz Pharmaceuticals Research UK Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
November 26, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 29, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 29, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 14, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 14, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
November 18, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 3, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 1, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • JZP926-105

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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