Final answer:
Dopamine agonists for Parkinson's disease include Levodopa, Ropinirole, and Pramipexole. Chlorpromazine is not used for Parkinson's as it is a dopamine antagonist used for treating schizophrenia.
Step-by-step explanation:
The medications used to treat Parkinson's disease are typically aimed at increasing dopamine levels or mimicking dopamine's action in the brain to compensate for the loss of dopaminergic neurons in the substantia nigra. Levodopa (L-DOPA), for example, is a precursor to dopamine that crosses the blood-brain barrier and is then converted into dopamine, enhancing dopamine neurotransmission.
Dopamine agonists, such as ropinirole and pramipexole, mimic dopamine by binding to dopamine receptors. This helps improve the motor symptoms of Parkinson's disease. These drugs are distinct from antipsychotics such as chlorpromazine, which function as dopamine antagonists by blocking dopamine's effects and are used to treat conditions such as schizophrenia.
In summary, to answer the question, dopamine or dopamine agonists used to treat Parkinson's disease include all of the following except b. Chlorpromazine, which is an antipsychotic drug that blocks dopamine receptors rather than mimicking or enhancing dopamine activity.