Cannabidiol Oral Solution as an Adjunctive Therapy for Treatment of Participants With Inadequately Controlled Lennox-Gastaut Syndrome

Inclusion Criteria: * Meets protocol-specified criteria for qualification and contraception, including clinical diagnosis of refractory LGS and onset of seizures according to protocol-specified criteria * Is able to speak and understand the language in which the study is being conducted, is able to understand the procedures and study requirements and has voluntarily signed and dated an informed consent form approved by the Institutional Review Board before the conduct of any study procedure * In the opinion of the Investigator, the participants and parent(s)/caregiver(s) are willing and able to comply with the study procedures and visit schedules, including venipuncture, twice daily dosing, accurate diaries, and the Follow-up Visits (if applicable). Exclusion Criteria: * Medical history is outside protocol-specified parameters * Clinically significant history of allergic reactions or significant sensitivities to cannabinoids or to any of the other ingredients in the study drug * Inadequate supervision by parents or guardians * History or current use of dietary supplements, drugs or over-the counter medications outside protocol-specified parameters * Signs, symptoms or history of any condition that, per protocol or in the opinion of the investigator, might compromise: 1) the safety or well-being of the participant or study staff; 2) the safety or well-being of the participant's offspring (such as through pregnancy or breast-feeding); 3) the analysis of results