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 18 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, laboratory
scoring and transient elastography ( a type of imaging test ) by FibroScan® to assess liver fibrosis will be performed in all participants entering into the study and repeated annually thereafter for up to 5 years.

This study aims to improve access of Veterans with epilepsy living in rural areas to the most important diagnostic procedure for the care of patients with epilepsy: the routine electroencephalogram (EEG). We will test a new method for recording EEG which uses a novel dry electrode system headset that does not require an EEG technologist to operate. The headset integrates the EEG electrodes and amplifier into a compact system which is easily placed on the head. This approach could make it possible for a nurse or nurse assistant with minimal training to record an EEG in a rural community based outpatient clinic (CBOC) as part of an epilepsy telemedicine outreach program along with clinical interviews. We will compare performance of this dry electrode system to standard EEG when it is used by EEG technologists in three VA medical centers. This project has the potential to improve access of Veterans to the EEG procedure and decrease cost to the Veterans Health Care System.

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.