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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Clinical pharmacology of doxacurium chloride. A new long-acting nondepolarizing muscle relaxant.

Doxacurium chloride (BW A938U) is a bis-quaternary benzylisoquinolinium diester nondepolarizing neuromuscular blocking compound that is minimally hydrolyzed by human plasma cholinesterase. The effect of bolus doses of doxacurium ranging from 10 to 80 micrograms/kg were studied in 81 consenting ASA physical status I and II patients anesthetized with nitrous oxide-oxygen-fentanyl-thiopental. The neuromuscular and cardiovascular effects of doxacurium were compared with those of eight patients receiving 100 micrograms/kg of pancuronium receiving identical anesthesia. The calculated ED95 for evoked twitch inhibition of the adductor pollicis at 0.15 Hz was 30 micrograms/kg. At 1.3 times the ED95 dose of doxacurium, recovery times to 5% and 25% of control twitch height were 59.2 +/- 4.1 (n = 23 of 26) and 75.7 +/- 5.6 (n = 23 of 26) min respectively. For pancuronium comparable recovery times were 81.7 +/- 10.3 (n = 8 of 8) and 83.0 +/- 8.4 (n = 5 of 8) min. Residual doxacurium blockade was readily antagonized by neostigmine. No dose-related effect on heart rate or mean arterial pressure was seen with doxacurium at doses up to and including 2.7 times the ED95 (80 micrograms/kg). Doxacurium administration did not result in any elevation of plasma histamine at doses up to and including 2.7 times the ED95. In this study doxacurium appears to be a long-acting nondepolarizing relaxant with readily reversible neuromuscular blocking effects and devoid of cardiovascular effects. This profile offers clinical advantages over current long-acting agents and further clinical trials seem appropriate.[1]


  1. Clinical pharmacology of doxacurium chloride. A new long-acting nondepolarizing muscle relaxant. Basta, S.J., Savarese, J.J., Ali, H.H., Embree, P.B., Schwartz, A.F., Rudd, G.D., Wastila, W.B. Anesthesiology (1988) [Pubmed]
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