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tolcapone
Tolcapone (brand name Tasmar) is a drug used to treat Parkinson's disease (PD). It is a selective, potent and reversible nitro catechol type inhibitor of enzyme catechol-O-methyl transferase (COMT). == Uses == Tolcapone is used in the treatment of Parkinson's disease as an adjunct to levodopa/carbidopa medication that is conventionally paired with an aromatic L-amino acid decarboxylase (AADC) inhibitor. Normally, administration of levodopa is compromised when COMT converts it to 3-methoxy-DOPA. By preventing this effect, more of the levodopa that is administered reaches the CNS. Additionally, levodopa that is in the CNS, after being converted to dopamine, will not be degraded by COMT when tolcapone inhibits COMT activity.
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