KEPPRA TOXICITY

A week ago yesterday, April 16th, my daughter started having symptoms of a toxic level to Keppra, the anti-seizure medication she was taking. She said she had been very tired for a couple of weeks. Her dose was 1000mg twide daily. She said she felt lightheaded & dizzy. She said she was having trouble processing information---like she was "high". That next morning she had a Keppra level drawn. Keppra was decreasd to 500 twice daily. By the next day she was having trouble speaking: slurred speech, speech arrest & stuttering with unsteady gait. At that point she went to the ER. She had a CT of her brain which was normal. She was admitted to the hosp. She had an EEG which was abnormal. She had a MRI of the Brain & an MRA, both which were normal. On 4-20 Keppra came back > 150. (Normal is 20-30). Last Keppra level was 3-24-07 & it was 48. The doctors there have never seen a Keppra level this high. Is it possible to network & see how long it will take the Keppra to leave her body? She has to walk with a walker. Her legs are too weak to support her without the walker. Her speech remains impaired with speech arrest & stuttering, plus it is very slow. ANYONE EVER HEARD OF SUCH A HIGH LEVEL??? Any treatment???