Olanzapine is a new type of antipsychotic drug, which is an antagonist of 5-hydroxytryptamine and dopamine. It can be used to treat schizophrenia, as well as excitement, agitation and agitated behavior associated with schizophrenia, as well as mania, bipolar disorder, bipolar depression, and behavioral disorders in patients with dementia and behavioral disorders in children and adolescents, as well as impulse control disorders, borderline Personality disorders. Olanzapine is generally effective for psychotic symptoms such as hallucinations, delusions, and agitation within a week, but behavioral improvement, cognitive improvement, and affective improvement may take several weeks or more, so it is important to maintain treatment. The side effects of olanzapine are mainly sedation and effects on metabolism, which may make patients feel sleepy, increase blood sugar and blood lipids, and gain weight. Therefore, while taking olanzapine, it is important to measure blood sugar, blood lipids, and body mass index regularly.