This article is from the Epilepsy FAQ, by Andrew Patrick (andrew@calvin.dgbt.doc.ca) with numerous contributions by others.
There are over 30 types of seizures, and some types are more severe
than others. Long tonic-clonic convulsions, for example, can produce
more physical and mental effects than shorter partial seizures. Some
people may experience very frequent seizures (every few hours), while
others can go for months or years without a seizure. Also, some
seizures are easily controlled by drug therapies, while others may
continue regardless of the medication that is tried.
 
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