In this research study a study drug named XEN1101 is being tested for the treatment of seizures. The main purpose of this study is to determine if XEN1101 can reduce the number of seizures and if it is safe to use. XEN1101 has been tested in other studies in epilepsy patients and it was considered to be well-tolerated. It had side effects that are similar to other anti-seizure medications commonly used to help patients with epilepsy.

This study is being done to understand whether a different type of electroencephalography (EEG) monitoring that permits longer monitoring is able to capture more seizures than regular EEG monitoring, and whether this new type of monitoring will improve clinical care. This type of EEG monitoring (REMI) is currently cleared by the United States Government Food and Drug Administration (or FDA) for use in hospitals but not yet cleared to be used at home.
Eligible subjects who have EEG monitoring scheduled with either a 3-day EEG monitoring performed at home or with a 3-day EEG monitoring schedule at the Medical University of South Carolina (MUSC). Subjects are in the study for approximately 4 weeks and will need to come to the study center for one or two visits. They will be asked to wear 4 of Epitel's REMI Sensors on their head, in addition to the regular EEG electrodes, for two 2-week REMI EEG monitoring periods. A 2nd visit (clinic visit) at MUSC may be needed if the recording is at MUSC, in order to start the second REMI EEG monitoring session.
At the end of the study, three independent epileptologists will review the REMI EEG recordings and compile a report of any findings. They will then provide this report to the subject's neurologist who will assess the value of the additional EEG information, and save the report within the MUSC medical record.

This is a study designed to assess whether there will be injury to the liver in participants who are already being treated Epidiolex or who are about to begin treatment with Epidiolex
Participants ages 4 and above on existing Epidiolex treatment for FDA-approved indications and participants with no previous experience of Epidiolex and who are about to be prescribed Epidiolex for an FDA-approved indication will be recruited from multiple sites in the US.
This study will include a screening period of up to 21 (± 7) days to assess participant eligibility. A physical exam, blood/serum laboratory tests and laboratory
scoring.

This 57-week, active-treatment, open-label (all participants will receive study drug throughout the study) extension trial ( enrolls participants of a previous clinical trial into another study) in which all participants gets the study drug is designed to assess the safety and tolerability of CVL-865 as adjunctive treatment (another treatment used together with the primary treatment) in subjects with drug-resistant focal onset seizures. This trial is open to subjects who completed treatment with the investigational medicinal product (IMP) in the double-blind (neither the participant or researchers know what study drug they are receiving) Phase 2 Trial CVL-865-SZ-001 and who, in the opinion of the investigator, could potentially benefit from treatment with CVL-865. There are 17 visits for a duration of 57 active-treatment weeks. The visits are approximately one month apart.

The purpose of this study is to find out if a drug called CVL-865 is safe and effective in the treatment for focal onset epilepsy. The study has an 8-week screening period, followed by a treatment period where adults 18 - 75 years of age that qualify for treatment will be randomly assigned to 3 different dose levels of the study drug. This is followed by a 4-week safety follow up period. The study will last approximately 25 weeks with approximately 7 research related clinic appointments. Participants that successfully complete the treatment period will also have the option of participating in a separate open-label extension study and all participants will be taking the study drug.