A Study to Evaluate the Safety, Tolerability and Efficacy of Oral Administration of PTL101 (Cannabidiol) as an Adjunctive Treatment for Pediatric Intractable Epilepsy

Inclusion Criteria: 1. Pediatric subjects with refractory epilepsy 2. 2-15 years old (inclusive), male or female 3. History of the any of the following seizure types: tonic, clonic, tonic-clonic in the form of partial seizures, partial seizures secondarily generalized or primary generalized, complex partial seizures and drop attacks (tonic/atonic). 4. At least four clinically countable seizures within 4 weeks of study entry \[tonic, clonic, tonic-clonic in the form of partial seizures, partial seizures secondarily generalized or primary generalized and/or complex partial seizures and drop attacks (tonic/atonic)\] 5. Subject on a stable regimen of 1-4 concomitant antiepileptic drugs (AEDs) for a minimum of 4 weeks prior to enrollment 6. History of treatment with at least four AEDs, including one trial of a combination of two concomitant drugs, without successful seizure control 7. Subjects with vagal nerve stimulation system must be on stable settings for a minimum of 6 months prior to enrollment 8. For subjects undergoing dietary treatment (e.g., ketogenic or modified Atkins diet): the fat to carbohydrate ratio must be stable for a minimum of eight weeks prior to enrollment 9. The subject's legal guardian voluntarily provides consent for participation in the study and signs an Informed Consent Form 10. Completed seizures diary for four weeks (±3 days) prior to initiation of the dose titration period (visit 2). Subject will be considered a screen failure if seizures diary was not appropriately completed. Exclusion Criteria: 1. The subject is currently using or has used cannabis-based or synthetic cannabinoid within three months of study entry 2. Subject is unwilling to abstain from use of cannabis-based or synthetic cannabinoid throughout the study period 3. Neurodegenerative or deteriorated neurological disease 4. History of heart failure 5. Known family history (first-degree) of psychiatric disorders 6. Psychosis or past psychotic event and/or anxiety disorder 7. Current or history of drug abuse/addiction 8. Renal, hepatic (ALT/AST \>2x upper limit of normal (ULN), bilirubin \>2x ULN), pancreatic dysfunctions or laboratory test abnormalities, at the investigator's discretion 9. Clinically significant finding in baseline ECG 10. Initiation of felbamate treatment within 9 months of screening 11. Allergy to CBD or any cannabinoid and/or formulation excipients 12. Subject is pregnant, lactating, or planning a pregnancy during the course of the study or within 3 months of study completion 13. Subject and legal guardian/caregiver unable to comply with study visits/requirements 14. Subject is currently enrolled in, or has not yet completed a period of at least 60 days since ending another investigational device or drug trial(s)