Lamotrigine is prescribed to treat epilepsy and bipolar disorder. While the drug is approved for controlling seizures in children with epilepsy, it is not approved to treat bipolar disorder in children. In addition, it is only used as a "maintenance" medication when used to treat bipolar disorder; it is not used to treat actual episodes of mania and depression. "Off-label" lamotrigine uses include the treatment of absence seizures.
Lamotrigine is approved as a "maintenance" treatment of bipolar disorder. This means that it is approved to help people with the condition keep their moods stable and to prevent episodes of mania and depression. It is not approved to treat these episodes themselves -- other medications may be more appropriate for treating acute episodes of mania or depression.