Why would risperdal be prescribed for a child?

Risperdal is an antipsychotic medication. It works by changing the effects of chemicals in the brain. Risperdal is used to treat schizophrenia and symptoms of Bipolar disorder (manic depression). Risperdal is also used in autistic children to treat symptoms of irritability. Risperdal may also be used for purposes other than those listed in this medication guide. http://www.drugs.com/risperdal.html