My father developed epilepsy after contracting mumps as an adult in the mid-sixties. (Mumps is usually considered a "childhood disease" like chicken pox, but, in adults, it can devlop into a form of encephalitis.) Up until about ten years ago, the available medications controlled, but did not eliminate his seizures. Even with the meds he would have one or two seizures during a typical year. But, newer drugs became available about ten years ago and he has not had a seizure since having had his prescription changed. The new stuff works very well.