CBD dramatically normalized the brain waves of a 9-year-old with Lennox-Gastaut syndrome

A 9-year-old boy with Lennox-Gastaut syndrome of unknown etiology treated with highly purified CBD (Epidiolex) achieved complete seizure control and near-normalization of EEG background activity. The EEG response was described as "dramatic," with previously abnormal patterns resolving. This degree of EEG improvement has not been previously described with CBD treatment.

Single case report with pre- and post-CBD electroencephalography documenting the electrophysiological response to cannabidiol treatment in a child with Lennox-Gastaut syndrome.

EEG normalization goes beyond seizure control: it suggests CBD may modify the underlying epileptic brain activity, not just suppress seizure expression. This could indicate disease-modifying rather than purely symptomatic effects.

Most anti-seizure medications control seizures without normalizing EEG. If CBD can normalize brain wave patterns in LGS, it may suggest that early intervention with CBD could prevent the progressive EEG deterioration seen in this syndrome.

Single case report; cannot determine if response is typical or exceptional; EEG improvement may be coincidental with development; no control for other variables; unknown etiology means underlying cause could influence response.