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Are Melanomas Activated by Carbidopa/Levodopa?
Carbidopa/levodopa carries a warning that it could activate certain 
melanomas. The following abstract will put you at ease.
<1>
Authors
  Weiner WJ.  Singer C.  Sanchez-Ramos JR.  Goldenberg JN.
Institution
  University of Miami School of Medicine, Department of Neurology, FL 33136.
Title
  Levodopa, melanoma, and Parkinson's disease. [Review]
Source
  Neurology.  43(4):674-7, 1993 Apr.
Abstract
  Previous reports and the Physicians' Desk Reference caution against the
  use of levodopa in Parkinson's disease (PD) patients with melanoma. A
  critical review of the literature reveals only anecdotal evidence to
  support a link between levodopa and melanoma. In fact, levodopa has an
  antitumor effect on melanoma. We report nine patients with PD and melanoma
  who were treated with levodopa/carbidopa (L/C). Current evidence suggests
  that L/C can be used safely in PD patients with a history of melanoma.
  [References: 27]

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