Drug Name	Cognitive Effects	Notes
Lamotrigine	Despite many studies, no cognitive side-effects have been consistently found
Vigabatrin	Sedation Psychosis
Gabapentin	Sedation
Topiramate	Difficulty sustaining attention Decreased verbal fluency (ease with which verbal language is produced) Psychomotor slowing Slowed thinking or confusion Impaired memory and concentration Mental slowing
Tiagabine	Drowsiness Incoordination/dizziness
Oxcarbazepine	No cognitive side effects have been reported Slight psychomotor stimulant effect
Zonisamide	Mild confusion Slowed thinking - may impair learning Nervousness May impair verbal learning at high doses
Levetiracetam	Behavioural/Psychiatric symptoms
Note: The absence of information for the new anti-convulsants likely reflects limited research done on them to date.