Levetiracetam (Keppra) is a medicine for epilepsy which is only beginning to be studied for psychiatric conditions.  So far the results are disappointing: Levetiracetam was not found helpful for bipolar depression, social anxiety or alcoholism.    

One promise for levetiracetam comes from a study that showed it may improve tardive dyskinesia.  This is a rare side effect to antipsychotics causes muscles to twitch involuntarily.  Although it is very rare, it is potentially permanent and difficult to treat, so the benefits found with levetiracetam is an important advance.

You can look up more about this medicine at:
Index of Drug Information

—Updated 5/28/12 by Chris Aiken, MD