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Rapacuronium bromide
Rapacuronium bromide.svg
Rapacuronium bromide
Clinical data
Other names[(2S, 3S, 5S, 8R, 9S, 10S, 13S, 14S, 16S, 17S)-3-acetyloxy-10,13-dimethyl-2-(1-piperidyl)-16-(1-prop-2-enyl-3,4,5,6-tetrahydro-2H-pyridin-1-yl)-2 ,3 ,4 ,5 ,6 ,7 ,8 ,9 ,11 ,12 ,14, 15, 16, 17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]propanoate
Routes of
ATC code
  • none
Legal status
Legal status
  • US: Withdrawn
Pharmacokinetic data
BioavailabilityNot applicable
Protein bindingVariable
MetabolismHydrolyzed to active metabolites
CYP system not involved
Elimination half-life141 minutes (mean)
ExcretionRenal and fecal
  • (2β,3α,5α,16β,17β)-3-(acetyloxy)-16-(1-allylpiperidinium-1-yl)-2-piperidin-1-yl-17-(propionyloxy)androstane bromide
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.211.226 Edit this at Wikidata
Chemical and physical data
Molar mass597.905 g·mol−1
3D model (JSmol)
  • [Br-].O=C(O[C@H]6[C@@H]([N+]1(C\C=C)CCCCC1)C[C@@H]5[C@]6(C)CC[C@H]3[C@H]5CC[C@H]4C[C@H](OC(=O)C)[C@@H](N2CCCCC2)C[C@]34C)CC
  • InChI=1S/C37H61N2O4.BrH/c1-6-20-39(21-12-9-13-22-39)32-24-30-28-15-14-27-23-33(42-26(3)40)31(38-18-10-8-11-19-38)25-37(27,5)29(28)16-17-36(30,4)35(32)43-34(41)7-2;/h6,27-33,35H,1,7-25H2,2-5H3;1H/q+1;/p-1/t27-,28+,29-,30-,31-,32-,33-,35-,36-,37-;/m0./s1 checkY
 ☒NcheckY (what is this?)  (verify)

Rapacuronium bromide (brand name Raplon) is a rapidly acting, non-depolarizing aminosteroid neuromuscular blocker formerly used in modern anaesthesia, to aid and enable endotracheal intubation, which is often necessary to assist in the controlled ventilation of unconscious patients during surgery and sometimes in intensive care. As a non-depolarizing agent it did not cause initial stimulation of muscles before weakening them.[1]

Due to risk of fatal bronchospasm it was withdrawn from the United States market by Organon on March 27, 2001, less than 2 years after its FDA approval in 1999.[2]


  1. ^ Onrust SV, Foster RH (November 1999). "Rapacuronium bromide: a review of its use in anaesthetic practice". Drugs. 58 (5): 887–918. doi:10.2165/00003495-199958050-00011. PMID 10595867.
  2. ^ Shapse D, et al. (Organon International) (27 March 2001). "Voluntary Market Withdrawal" (PDF). Food and Drug Administration. Archived from the original (PDF) on 24 September 2008.