Schizophrenia and Parkinson’s are completely different disorders. Antipsychotic medications prescribed for schizophrenia can cause “Parkinsonian” side effects that resemble Parkinson’s, but are still unrelated. Because schizophrenia can interfere with a person’s ability to take care of themselves, schizophrenics are more likely to have weaker immune systems, and treatment with antipsychotics can exacerbate this in some cases.
The term is “Dopamine *agonist*” not antagonist. These medications block dopamine by making the brain think it’s made enough, and are used to reduce involuntary motor agitation (Parkinson’s, restless leg syndrome).
Dopamine agonists do not make a person immune to disease, and there is nothing that will make a person immune to cancer.
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