Olanzapine is a medication primarily used to treat mental health conditions such as schizophrenia and bipolar disorder. It belongs to a class of drugs known as atypical antipsychotics, which work by affecting certain chemicals in the brain to help improve mood, thoughts, and behavior. This medication can help reduce symptoms like hallucinations, delusions, and mood swings. It is usually taken as a tablet or an injection, and while it can be effective, it may also cause side effects such as weight gain, drowsiness, and dry mouth. Regular monitoring by a healthcare provider is important.