Olanzapine is a type of drug called an atypical antipsychotic. It is sold under a variety of brand names including Zolafren, Zydis and Zyprexa.
Olanzapine is used to treat some of the symptoms of schizophrenia, (such as hallucinations and hostility) and some of the symptoms of bipolar disorder (such as mania).
Olanzapine is believed to work by changing the amount and action of several neurotransmitters in the brain, in particular serotonin and dopamine.
Olanzapine is sometimes used to treat problem behaviours in some autistic people, including hyperactivity, aggression, and self-injurious behaviours.