epilepsy
"My experience on keppra was awful . Partly responsible for me developing a state of encephalopathy.  
Mood was evil. I was threatening to strangers and family. I'd flip so suddenly from 0 to 100 without warning at the slightest word out of place. 
I'd say it's dangerous from patient perspective  and would not advocate it as a nurse.
Thoughts of negative actions... prolific"