Largest Study Ever on Cannabis and Epilepsy Finds it Can Help Treat the Condition

A bottle of cannabis tincture.

The largest study ever conducted on cannabis and epilepsy was presented this week at the American Epilepsy Society’s annual meeting in Philadelphia.

For the study, 313 children from 16 different epilepsy centers around the United States were put on a regimen of the cannabis compound cannabidiol. After a three-month period, 261 of these children had the amount of convulsive seizures (also called grand mal or tonic-clonic seizures) they experience reduced by an average of nearly half, while experiencing little to no side effects.

In addition, some patients experienced an 100% reduction in seizures; “In the subsequent periods, which are very encouraging, 9 percent of all patients and 13 percent of those with Dravet Syndrome epilepsy were seizure-free”, says Dr. Orrin Devinsky, a neurologist at the New York University Langone Medical Center, noting that; “Many have never been seizure-free before”.

The study concludes: “These results from an uncontrolled study support the animal studies and prior reports showing that CBD may be a promising treatment for TRE [treatment-resistant epilepsy] and it is generally well-tolerated in doses up to 25mg/kg/day.

The full study can be found by clicking here. The full abstract of the study can be found below:


Cannabidiol (CBD) is the most abundant non-psychoactive cannabinoid in the cannabis plant. Animal studies demonstrate anticonvulsant efficacy in multiple species and models. Anecdotal reports suggest efficacy in children with treatment-resistant epilepsies (TRE), including Dravet Syndrome (DS) and Lennox-Gastaut Syndrome (LGS). We report current results in our expanded access treatment program.
Children and young adults with TRE in an expanded access compassionate use program for CBD were enrolled in a prospective observational study. During the 4 week baseline, parents/caregivers kept prospective seizure diaries of all countable motor seizure types. Patients received a highly standardized pharmaceutical plant-derived, purified CBD. (Epidiolex: GW Pharma), at a gradually increasing dose from 2-5 mg/kg/day until intolerance occurred or a maximum dose of 25 mg/kg/day was achieved. Patients were seen at regular intervals of 2-4 weeks during the initial 12 weeks of therapy. Testing for hematologic, liver, kidney function and AED levels was performed at baseline, and after 4, 8 and 12 weeks of CBD therapy.
261 patients received at least 3 months of treatment and had available data at last group data collection (136 (52%) were male; average age 11.8 years, range 4 months-41 years; average weight 38 kg; range 6.4-127). The most common diagnoses were DS (44; 17%) and LGS (40; 15%). The average # of concomitant AEDs was 3.0. After 3 months of therapy, the median overall seizure frequency reduction was 45.1% in all patients and 62.7% in DS patients. For LGS patients, the median reduction of atonic seizures from baseline was 71.1%. Among all patients, 47% had a ≥50% reduction in seizures. Seizure-freedom at 3 months occurred in 9% of patients and 13% of DS patients. Clobazam co-therapy was associated with a higher rate of treatment response (≥50% convulsive seizure reduction): 57% v. 39%; this may reflect elevations in the desmethyl clobazam metabolite. Safety data from 313 patients representing 180 patient years was available at 16 sites. Adverse events in ≥10% of patients included somnolence (23%), diarrhea (23%), fatigue (17%), decreased appetite (17%), convulsions (17%) and vomiting (10%). 14 patients (4%) had an adverse event leading to discontinuation of CBD. 36 patients (12%) withdrew primarily due to lack of efficacy. Serious Adverse Events (SAEs) were reported in 106 patients (34%), including 7 deaths, none of which were considered treatment-related. 16 patients (5%) had SAEs that were considered treatment-related, including altered liver enzymes (4 pts; all were also on valproate and clobazam), status epilepticus/convulsion (4), diarrhea (4), decreased weight (3), thrombocytopenia (1), and others.
These results from an uncontrolled study support the animal studies and prior reports showing that CBD may be a promising treatment for TRE and it is generally well-tolerated in doses up to 25mg/kg/day. Epidiolex is now being investigated in randomized controlled studies in DS and LGS.


4 thoughts on “Largest Study Ever on Cannabis and Epilepsy Finds it Can Help Treat the Condition”

  1. One of the first stories I heard about marijuana’s medicinal properties was about a child who had multiple severe seizures a day. After trying cannabis as a treatment option, the seizures pretty much stopped. I was a little hesitant to believe that, but seeing the results here shows me that this is definitely a viable treatment option for epilepsy. Thank you for sharing this.

  2. Our government needs to, immediately, implement an emergency law, and make Cannabis and the medicine available to everybody. This study, and many others, prove that this plant saves lives.

    But you watch… nothing will be done. Nothing.

  3. I’m suufer grand mal seiziures due to an an assault in 2000 an have Neva had them since because I smoke weed I’m not game to stop invade its starts seizures


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