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carbidopa

n. A drug given to people with Parkinson's disease to inhibit peripheral metabolism of levodopa.

Wikipedia
Carbidopa

Carbidopa (Lodosyn) is a drug given to people with Parkinson's disease in order to inhibit peripheral metabolism of levodopa. This property is significant in that it allows a greater proportion of peripheral levodopa to cross the blood–brain barrier for central nervous system effect.