epilepsy
"I have taken Keppra (levetiracetam) since January of 2007, so nearly 9 years.  I was taking another seizure drug, (Tegretol), but it was causing problems with the sodium level in my blood, so my Neurologist changed me to Keppra 500 me twice a day, and I have had no further problem.  I was changed to Keppra 750 2 years ago, as a precaution against any possible future seizures.  I have had NO SEIZURES while taking Keppra, and would recommend it to anyone who needs seizure control."