Effect of intravenous thiamine on pralidoxime kinetics

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Abstract
Subjects were given pralidoxime chloride (5 mg/kg, intravenously) alone and again while they were receiving an infusion of thiamine hydrochloride. After the addition of thiamine: (1) overall, the urinary excretion of oxime was the same but the amount excreted in the first three hours was smaller; (2) the plasma half-life of oxime lengthened; (3) the plasma concentrations of oxime rose; and (4) the intercompartmental clearances and rate constant for elimination for oxime fell. These changes suggest that thiamine and oxime compete for a common renal secretory mechanism or that thiamine alters the membrane transport of oxime.

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