A group of drugs more commonly known as antiseizure drugs or antiepileptic (AED) drugs.  They are primarily used to treat epileptic seizures.  They suppress the excessive rapid firing of neurons during seizures and also prevent the spread of the seizure within the brain.  They are also being increasingly used in the treatment of nerve pain (neuropathic pain) and migraine headaches.  Because they seem to act as a mood stabilizer, they have also been increasingly used to treat Bipolar Disorder and Borderline Personality Disorder.