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

Vecuronium inhibits histamine N-methyltransferase.

Although there have been clinical reports of significant hypotension and flushing associated with the use of vecuronium, it produces minimal cardiovascular effects in the vast majority of patients. In addition, there is no evidence that vecuronium stimulates the release of histamine. The authors performed in vitro kinetic studies to determine the effect of vecuronium on histamine N-methyltransferase (HNMT), the primary catabolic enzyme for histamine in humans. They also examined plasma from patients who had received vecuronium (0.1 or 0.2 mg/kg) to determine whether clinically used concentrations of the drug could inhibit HNMT. It was determined that vecuronium is a strong inhibitor of HNMT; apparent Ki = 1 microM. The inhibition is competitive with respect to methyl-donor and noncompetitive with respect to histamine. Vecuronium, in doses greater than or equal to 0.1 mg/kg, may delay the metabolism of histamine by HNMT in vitro.[1]


  1. Vecuronium inhibits histamine N-methyltransferase. Futo, J., Kupferberg, J.P., Moss, J., Fahey, M.R., Cannon, J.E., Miller, R.D. Anesthesiology (1988) [Pubmed]
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