Seizure associated with olanzapine

Atypical antipsychotics are known to be associated with electroencephalogram abnormalities. Olanzapine can lower seizure threshold and induce epileptiform discharges. However in patients on Olanzapine for the treatment of a primary psychiatric disorder, clinical seizure is a rare occurrence. We report the case of a 23-year-old female with mild mental retardation with schizophrenia with obsessive compulsive disorder who developed new-onset generalized tonic-clonic seizure probably due to Olanzapine. Electroencephalogram showed epileptiform discharges. The seizure risk associated with Olanzapine was reviewed.