text: Search Encyclopedia: List of Topics Print This Page Secondary parkinsonism Central nervous system
  MPTP (a contaminant in some street drugs) There have been rare cases of secondary parkinsonism among IV drug users who injected a substance called MPTP, which can be produced when making a form of heroin.
  Treating conditions that cause secondary parkinsonism may decrease the risk. People taking medicines that can cause secondary parkinsonism should be carefully monitored by the provider to prevent the condition from developing.
  Lang AE. Parkinsonism. In: Goldman L, Schafer AI. Goldman's Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 409.