Some people develop Parkinsonism after they have taken certain
medications and people with Parkinson’s may also find their symptoms
worsen when they are treated with these medications. This is known as drug-induced parkinsonism.
The medications involved are generally those that block the action
of dopamine, the neurotransmitter that is depleted in the brains of
people with Parkinson's. These include antipsychotic/neuroleptic
medication used to treat schizophrenia and other psychiatric problems,
prochlorperazine (Stemetil) used to treat dizziness and nausea, and
Metoclopromide (Maxolon) used to treat nausea and indigestion.