Efficacy and Safety of GWP42003-P for Seizures Associated With Lennox-Gastaut Syndrome in Children and Adults

Summary

The primary objective of this study was to evaluate the efficacy of GWP42003-P as adjunctive treatment in reducing the number of drop seizures when compared with placebo in participants with Lennox-Gastaut syndrome (LGS).

Timeline

Start

2015-06-08

Primary completion

2016-05-19

Completion

2016-05-19

Publications

• Results Devinsky O, Patel AD, Cross JH, Villanueva V, Wirrell EC, Privitera M, Greenwood SM, Roberts C, Checketts D, VanLandingham KE, Zuberi SM; GWPCARE3 Study Group. Effect of Cannabidiol on Drop Seizures in the Lennox-Gastaut Syndrome. N Engl J Med. 2018 May 17;378(20):1888-1897. doi: 10.1056/NEJMoa1714631.
• Specchio N, Auvin S, Greco T, Lagae L, Nortvedt C, Zuberi SM. Clinically Meaningful Reduction in Drop Seizures in Patients with Lennox-Gastaut Syndrome Treated with Cannabidiol: Post Hoc Analysis of Phase 3 Clinical Trials. CNS Drugs. 2025 Oct;39(10):1025-1036. doi: 10.1007/s40263-025-01201-8. Epub 2025 Aug 7.
• Auvin S, Nortvedt C, Fuller DS, Sahebkar F. Seizure-free days as a novel outcome in patients with Lennox-Gastaut syndrome: Post hoc analysis of patients receiving cannabidiol in two randomized controlled trials. Epilepsia. 2023 Jul;64(7):1812-1820. doi: 10.1111/epi.17618. Epub 2023 Apr 28.
• Brigo F, Jones K, Eltze C, Matricardi S. Anti-seizure medications for Lennox-Gastaut syndrome. Cochrane Database Syst Rev. 2021 Apr 7;4(4):CD003277. doi: 10.1002/14651858.CD003277.pub4.
• Privitera M, Bhathal H, Wong M, Cross JH, Wirrell E, Marsh ED, Mazurkiewicz-Beldzinska M, Villanueva V, Checketts D, Knappertz V, VanLandingham K. Time to onset of cannabidiol (CBD) treatment effect in Lennox-Gastaut syndrome: Analysis from two randomized controlled trials. Epilepsia. 2021 May;62(5):1130-1140. doi: 10.1111/epi.16878. Epub 2021 Apr 2.
• Perry MS. Don't Fear the Reefer-Evidence Mounts for Plant-Based Cannabidiol as Treatment for Epilepsy. Epilepsy Curr. 2019 Mar-Apr;19(2):93-95. doi: 10.1177/1535759719835671.

Drugs

Indications