Finally, on February 20, 1792, President Washington formally created the U.S. Postal Service with the signing of the Postal Service Act, which outlined in detail Congressional power to establish official mail routes.
The two concerns are firstly that Haldol (like all other antipsychotics) can cause tardive dyskinesia and as that is clinically related to Parkinson's this is an express concern with people with Parkinson's.
Most drugs available for the treatment of Parkinson's disease work to imitate the effect of dopamine in the brain. That is because low dopamine levels in the brain have been linked to Parkinson's disease. These drugs are made to trick the brain into thinking it is receiving dopamine.