Add-on therapy or monotherapy in adults (>12 years) with tonic-clonic seizures and seizures associated with Lennox-Gastaut Syndrome. Add-on therapy in children 2-12 years with tonic-clonic seizures and seizures associated with Lennox-Gastaut Syndrome. Initial monotherapy is not recommended in paediatric patients who was recently diagnosed with epilepsy. As mood stabilizer, especially with prevention of depressive episode, in patients with bipolar disorder.