hmmm, the Cannabis As Living Medicine website disucsses pot and epilepsy -

"Treating Epilepsy with Marijuana

Some people with grand mal seizures say they can prevent their seizures entirely by smoking marijuana. Others, who suffer complex partial seizures, report that marijuana also curbs their symptoms and prevents loss of consciousness. Marijuana is not considered useful for treating petit mal or absence seizures and may even worsen them.

Some patients find that marijuana works in conjunction with other drugs they are taking. Others find that marijuana works best for them when it is used without other drugs. Either way, these epileptic patients have made marijuana a necessary part of their medical treatment.

People using marijuana to control epilepsy should be aware that withdrawal from any medication that controls seizures may leave you more susceptible to the seizures. Marijuana is no exception. Patients with epilepsy are advised to exercise caution when using oral THC because there is not sufficient knowledge about the convulsive or anti-convulsive properties of the single compound."

another page with pros and cons is at www.marijuanainfo.org