Olanzapine is used to treat schizophrenia and manic depression (bipolar disorder). Schizophrenia is a mental condition in which the person may feel, hear or see things that are not there (hallucinations), believe things that are not true, and feel unusually suspicious or confused. Manic depression, or bipolar disorder, is a serious brain disorder in which a person experiences extreme mood swings (variance in thinking) and frequent mood and behavioural changes. Olanzapine contains 'Olanzapine' that works by restoring the balance of chemical messengers (dopamine and serotonin) in the brain and improves thinking mood, and behaviour. It helps in clear thinking and decreases hallucinations. It is used for treating manic episodes of bipolar disorder and agitation in schizophrenia.