Clinical trial · Interventional
An Open-label Extension Trial of Cannabidiol (GWP42003-P, CBD) for Seizures in Tuberous Sclerosis Complex (GWPCARE6)
A Double-blind, Randomized, Placebo-controlled Study to Investigate the Efficacy and Safety of Cannabidiol (GWP42003-P, CBD) as Add-on Therapy in Patients With Tuberous Sclerosis Complex Who Experience Inadequately-controlled Seizures
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
This trial consists of 2 parts: a double-blinded phase and an open-label extension phase. The open-label extension phase only will be described in this record. All participants will receive the same dose of GWP42003-P. However, investigators may subsequently decrease or increase the participant's dose until the optimal dose is found.
Conditions
Conditions (2)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Seizures | — | UNRESOLVED | — |
| Tuberous Sclerosis Complex | — | UNRESOLVED | — |
Interventions
Interventions (1)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| GWP42003-P | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- type
- EXPERIMENTAL
- label
- GWP42003-P
- description
- 100 mg/mL GWP42003-P oral solution taken twice daily (morning and evening). Participants will be dosed up to a maximum of 50 mg/kg/day. Dose may be lower if Investigator judges benefit and/or tolerability issues.
- interventionNames
- Drug: GWP42003-P
Primary outcomes (2)
- measure
- Number of Participants With Any Treatment-emergent Adverse Events, Discontinuations Due to AEs, Serious AEs, and Treatment-related AEs (TEAE)
- timeFrame
- OLE Day 1 up to 4 years
- description
- An adverse event (AE) was defined as any new unfavorable/unintended signs/symptoms (including abnormal laboratory findings), or diagnosis or worsening of a pre-existing condition, which occurred following screening and at any point up to the post-treatment safety follow-up visit, which may or may not be related to the IMP. An AE that started, or worsened in severity or seriousness, following the first dose of IMP was considered a TEAE. A serious AE was defined as any AE that results in any of the following outcomes: death, life-threatening adverse experience, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability/incapacity, congenital anomaly/birth defect, or cancer, any other experience that suggests a significant hazard, contraindication, side effect or precaution that may require medical or surgical intervention to prevent one of the outcomes listed above, or an event that changes the risk/benefit ratio of the study.
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 1 Year
- Maximum age
- 65 Years
Show eligibility criteria text
Key Inclusion Criteria: * Completion of the GWEP1521 Blinded Phase
References
Publications (2)
- BACKGROUNDThiele EA, Bebin EM, Bhathal H, Jansen FE, Kotulska K, Lawson JA, O'Callaghan FJ, Wong M, Sahebkar F, Checketts D, Knappertz V; GWPCARE6 Study Group. Add-on Cannabidiol Treatment for Drug-Resistant Seizures in Tuberous Sclerosis Complex: A Placebo-Controlled Randomized Clinical Trial. JAMA Neurol. 2021 Mar 1;78(3):285-292. doi: 10.1001/jamaneurol.2020.4607. PMID 33346789
- RESULTThiele EA, Bebin EM, Filloux F, Kwan P, Loftus R, Sahebkar F, Sparagana S, Wheless J. Long-term cannabidiol treatment for seizures in patients with tuberous sclerosis complex: An open-label extension trial. Epilepsia. 2022 Feb;63(2):426-439. doi: 10.1111/epi.17150. Epub 2021 Dec 27. PMID 34957550