Carbidopa

Revision as of 15:04, 4 June 2014 by Gerald Chi (talk | contribs) (Changed protection level for "Carbidopa" ([Edit=Allow only autoconfirmed users] (expires 15:04, 18 June 2014 (UTC)) [Move=Allow only autoconfirmed users] (expires 15:04, 18 June 2014 (UTC))))
Jump to navigation Jump to search
Carbidopa
File:Carbidopa.svg
Clinical data
[[Regulation of therapeutic goods |Template:Engvar data]]
Legal status
Legal status
  • UK: POM (Prescription only)
Pharmacokinetic data
Protein binding76%
Metabolismdecarboxylated to dopamine in extracerebral tissues
Elimination half-life2 hours
Identifiers
CAS Number
PubChem CID
DrugBank
E number{{#property:P628}}
ECHA InfoCard{{#property:P2566}}Lua error in Module:EditAtWikidata at line 36: attempt to index field 'wikibase' (a nil value).
Chemical and physical data
FormulaC10H14N2O4
Molar mass226.229 g/mol

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

Carbidopa inhibits aromatic-L-amino-acid decarboxylase (DOPA Decarboxylase or DDC), an enzyme important in the biosynthesis of L-tryptophan to serotonin and in the biosynthesis of L-DOPA to Dopamine (DA). Along with carbidopa, other DDC inhibitors are benserazide (Ro-4-4602), difluromethyldopa, and α-methyldopa.

Used in tandem with L-DOPA (trade name levodopa, a dopamine precursor converted in the body to dopamine), it increases the plasma half-life of levodopa from 50 minutes to 1 1/2 hours. CarbiDOPA cannot cross the blood brain barrier, so it inhibits only peripheral DDC. It thus prevents the conversion of L-DOPA to dopamine peripherally. This reduces the side effects caused by dopamine on the periphery, as well as increasing the concentration of L-DOPA and dopamine in the brain.

The combination of L-DOPA and carbiDOPA carries the brand names of Sinemet®, Parcopa® and Atamet®; Stalevo® also contains entacapone, which enhances the bioavailability of carbidopa and levodopa.

Carbidopa is also used in combination with 5-HTP, a naturally-occurring amino acid which is a precursor to the neurotransmitter serotonin and an intermediate in tryptophan metabolism. Carbidopa prevents 5-HTP's metabolism in the liver, which can lead to elevated levels of serotonin in the bloodstream. Research shows that co-administration of 5-HTP and carbidopa greatly increases plasma 5-HTP levels.

External links


Template:Pharma-stub

de:Carbidopa it:Carbidopa