Olanzapine is an atypical antipsychotic used to treat schizophrenia and related disorders. It works by blocking dopamine and serotonin receptors in the brain, which helps reduce hallucinations, delusions, and disorganized thinking. Olanzapine can also improve mood and reduce agitation, making it helpful for both acute psychotic episodes and long-term maintenance. Common side effects include weight gain, increased appetite, sleepiness, and metabolic issues such as higher blood sugar or cholesterol. It is available in tablets, orally disintegrating tablets, and injectable forms, giving flexibility in treatment settings.