Carbidopa (MK-486) is a drug given to people with Parkinson's disease in order to inhibit peripheral metabolism of levodopa.

GoldBamboo

... CARBIDOPA (Lodosyn®) is a used to treat Parkinson''s disease. Carbidopa is always given with levodopa (e.g., Dopar® or Laridopa®) or carbidopa-levodopa combination products (e.g., Sinemet®). Carbidopa is added to levodopa to increase its therapeutic effects and reduce the risk of certain side effects, such as nausea. Generic carbidopa tablets are not available. ...
Drug Digest - more...

Carbidopa (MK-486) is a drug given to people with Parkinson's disease in ord ...
Wikipedia - [full article]

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