tokens: Median seizure frequency prior to treatment with levetiracetam ( 2 . 1 seizures / mo ) was significantly higher than median seizure frequency after initiation of levetiracetam treatment ( 0 . 42 seizures / mo ) , and 7 of 10 cats were classified as having responded to levetiracetam treatment ( ie , reduction in seizure frequency of > or = 50 % ) .