List of products in the National Drug Code with proprietary name . This medication is used to treat the symptoms of Parkinson's disease. It can improve your ability to move during frequent "off" periods. It can decrease shakiness (tremor), stiffness, slowed movement, and unsteadiness. This medication is thought to work by helping to restore the balance of a certain natural substance (dopamine) in the brain. Apomorphine is used to treat "off" episodes when they occur. It is not used to prevent "off" episodes. This drug should not be used instead of your usual medications for Parkinson's disease. Continue taking all your medications as directed by your doctor.