Epilepsy is the condition where cannabinoid evidence is strongest and also the one most often misdescribed. This sub-board covers what cannabidiol has been shown to do in specific seizure syndromes, and why that does not generalise to epilepsy as a whole.
The controlled evidence sits with purified, pharmaceutical-grade cannabidiol in a small number of rare and severe childhood epilepsies, given alongside existing antiepileptic drugs rather than instead of them. That is a narrower claim than the one usually made for it, and the gap between a standardised pharmaceutical preparation and an oil of unknown concentration is part of why results differ so widely in practice.
Two things belong in every thread here. Cannabidiol interacts with several common antiepileptic medicines through shared liver metabolism, which can change blood levels of a drug the patient depends on, so this is a conversation to have with the treating neurologist rather than around them. And nobody here can prescribe, supply or recommend a product: under Thai law only the flower is a controlled herb, advertising is prohibited, and online sale is prohibited.
Where to start
Related elsewhere on the forum: Start Low, Go Slow: What Published Guidance Says About Dosing in General Medical Cannabis Discussions.