CBD is the first cannabis-derived compound with an FDA-approved indication for epilepsy (Epidiolex®). For specific childhood-onset epilepsies—Dravet syndrome and Lennox-Gastaut syndrome—CBD can meaningfully reduce seizure burden when used under specialist supervision. Below, we explain what the strongest evidence shows, how CBD may work, and how to approach CBD safely in real life.
What the strongest evidence shows
- NEJM 2017 (Dravet): Purified CBD produced a 39% median reduction in convulsive seizures vs. 13% with placebo in drug-resistant Dravet syndrome.
- FDA approval (2018): Based on multiple RCTs, Epidiolex® (purified CBD) is approved for Dravet, LGS, and TSC (tuberous sclerosis complex).
- Real-world experience: Many centers report additional “responder” subsets; others require combination adjustments to balance efficacy and side effects.
How CBD may reduce seizures
CBD does not act like classic antiseizure drugs. Proposed mechanisms include modulation of excitatory neurotransmission (e.g., TRPV, GPR55) and inflammatory signaling. The result for some patients is lower neuronal hyperexcitability and fewer convulsive events.
Purified Rx CBD vs. consumer CBD
- Purified Rx: Epidiolex® has standardized dosing, quality controls, and safety monitoring protocols.
- Consumer CBD: If a neurologist considers an OTC trial, use only COA-verified products with clear per-mL potency and contaminant screens (metals/solvents/microbes). Avoid THC in children unless specifically directed.
Safety, interactions, and lab monitoring
- Liver enzymes: CBD may elevate transaminases, especially with valproate—baseline and periodic LFTs are recommended.
- Drug interactions (CYP2C19/CYP3A): CBD can raise levels of clobazam/N-desmethylclobazam and other ASMs; dose adjustments are often needed.
- Adverse effects: Somnolence, diarrhea, decreased appetite, and fatigue; most are dose-related and manageable with titration.
Practical product fit (when appropriate and supervised)
- Daytime clarity (adjunct): CBD-only tincture with precise mg/mL labeling (no THC) for pediatric or adult daytime use—Restore – CBD.
- Evening support: In select adult cases, a tiny balanced CBD:THC dose may be considered for sleep/anxiety only under specialist direction.
- Verification: Match lot numbers to COAs before dosing.
Dosing & titration (neurologist-led)
- Start low, go slow: Specialists typically titrate mg/kg/day over weeks, monitoring efficacy and side effects.
- Keep a seizure diary: Record frequency, type, duration, triggers, and rescue-med usage to guide adjustments.
- Never stop ASMs abruptly: Changes to existing antiseizure meds must be prescriber-directed.
What families should expect
Most patients require combination therapy; some become “responders,” others see modest benefit, and a subset may not respond. Clear goals (e.g., >50% reduction in convulsives, fewer ER visits, improved recovery) help define success.
Next step: coordinate with your epilepsy team
Our dosing specialists work alongside neurologists to align product, titration, and mg/kg with your current regimen and labs—and teach families how to read COAs. Book a consultation or explore CBD tinctures that meet strict third-party testing.
About the Author
Lee Simpson is the founder of King Harvest, producing FECO and tinctures—each third-party tested and designed for measurable, clinician-friendly dosing.
