Olanzapine is an oral antipsychotic medication used to treat mental illnesses in young and elderly people. In the elderly, this mental illness is mostly caused by dementia while schizophrenia is the cause in younger people. It is also used in the treatment of mood swings and changes such as schizophrenia and bipolar disorder. When combined with other medications, it has been utilized in the treatment of depression. In patients with severe mental illness, it is known to have reduced moments of hallucinations and aided in better clarity of thinking in addition to a more active life. This medication belongs to a class of drugs known as antipsychotics known to aid the restoration of natural substances in the human brain.