Decamethonium

Decamethonium (Syncurine) is a depolarizing muscle relaxant or neuromuscular blocking agent,[1] and is used in anesthesia to induce paralysis.

Decamethonium
Clinical data
ATC code
  • None
Identifiers
IUPAC name
  • Trimethyl-(10-trimethylammoniodecyl)ammonium
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
ChEBI
ChEMBL
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC16H38N2
Molar mass258.494 g·mol−1
3D model (JSmol)
SMILES
  • [Br-].[Br-].C(CCCC[N+](C)(C)C)CCCCC[N+](C)(C)C
InChI
  • InChI=1S/C16H38N2.2BrH/c1-17(2,3)15-13-11-9-7-8-10-12-14-16-18(4,5)6;;/h7-16H2,1-6H3;2*1H/q+2;;/p-2 Y
  • Key:HLXQFVXURMXRPU-UHFFFAOYSA-L Y
 NY (what is this?)  (verify)

Pharmacology

Decamethonium, which has a short action time, is similar to acetylcholine and acts as a partial agonist of the nicotinic acetylcholine receptor. In the motor endplate, it causes depolarization, preventing further effects to the normal release of acetylcholine from the presynaptic terminal, and therefore preventing the neural stimulus from affecting the muscle. In the process of binding, decamethonium activates (depolarizes) the motor endplate - but since the decamethonium itself is not degraded, the membrane remains depolarized and unresponsive to normal acetylcholine release.

Contraindications/limitations

Decamethonium does not produce unconsciousness or anesthesia, and its effects may cause considerable psychological distress while simultaneously making it impossible for a patient to communicate. For these reasons, administration of the drug to a conscious patient is strongly advised against, except in necessary emergency situations.

Decamethonium was used clinically in the UK for many years, but it is now available only for research purposes.

See also

References
  1. Lee C, Jones T (May 2002). "Molecular conformation-activity relationship of decamethonium congeners". British Journal of Anaesthesia. 88 (5): 692–9. doi:10.1093/bja/88.5.692. PMID 12067008.
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