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Epilepsy Ontario (Canada) stated on its website (accessed on May 3, 2006):

“Dependable documentation of the effectiveness of Cannabis sativa as an antiepileptic medication is severely limited at this time.

Some accounts show a reduction in seizure frequency and/or severity for some people with epilepsy. Whether this is due to anticonvulsant properties of cannabis or to a reduction in physical and/or psychological stress levels is not fully known and cannot be clarified without further comprehensive scientific scrutiny….

Like any drug, cannabis probably has potential to both harm and heal. Without bone-fide scientific investigation and evaluation, the efficacy of Cannabis sativa as an antiepileptic drug cannot be safely or surely ascertained….

Since THC has dual effects and there are unknown properties of marijuana, marijuana is NOT recommended for people with epilepsy.

Reliable documentation of the effectiveness of marijuana as an anti-epileptic medication is extremely limited at this time. While some accounts show a reduction in seizure frequency and/or severity in some people who have epilepsy, others suggest that marijuana may actually trigger seizures. Further investigation is needed to determine the effectiveness and side effects of cannabis as an anti-seizure drug.”

May 3, 2006