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If Parkinson symptoms are caused by a medication we are not talking about Parkinson's disease but parkinsonism. Psychiatric medication (neuroleptics) can cause parkinsonism) , but also a lot of the anti-vomiting medications (!!!). One anti-nausea medication is domperidon (Motilium), which is a good drug and doesn't give parkinsonism and can therefore be given to Parkinson patients who experience some nausea due to some anti-Parkinson medication. I believe, however, that domperidone, is still not available in the USA, even though it is present in Europe for over 10 years. In addition, anti-dizziness medication may cause parkinsonism, so be aware!!!!!!! Chris van der Linden, M.D. St. Lucas Hospital Ghent Ghent, BELGIUM