Which antipsychotic is approved for adolescent use in autism treatment?

Risperidone is the correct choice as it is the antipsychotic specifically approved for use in adolescents with autism. The approval is based on its efficacy in managing irritability and behavioral symptoms associated with autism spectrum disorder (ASD). Clinical studies have shown that risperidone can help reduce aggression, temper outbursts, and mood swings in this population, which makes it a suitable option for treating these particular symptoms of autism.

In contrast, while other medications may be used off-label to treat symptoms related to autism, they do not have the same level of established approval specifically targeting the treatment of autism in adolescents. For example, haloperidol and pimozide, although used in certain conditions, are primarily indicated for different psychiatric disorders, and thioridazine is less commonly used today due to safety concerns and availability. The focus for treating autism has shifted to medications like risperidone that have been specifically studied and approved for this age group and condition.