List of products in the National Drug Code with proprietary name . Ziprasidone injection is used to treat occurrences of severe agitation in patients with schizophrenia. It works by helping to restore the balance of certain natural substances (neurotransmitters) in the brain. Ziprasidone injection is used when quick relief of your symptoms is required. It is not used together with the form of this medication that is taken by mouth. An injection of ziprasidone works quickly to reduce tension and anxiety which, if untreated, can result in dangerous behavior and interfere with your treatment and care.