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Displacement of lidocaine from serum alpha 1-acid glycoprotein binding sites by basic drugs.

Abstract：

:Since little is known of the number and types of binding sites on alpha 1-acid glycoprotein (AAG) and because drug-drug protein binding interactions often fail to fit a simple model, a study of the effect of 9 known AAG binding drugs on lidocaine free fraction (LFF) was performed. Serum was obtained from 10 healthy males, pooled and various concentrations (from 0.15 to 1000 micrograms/ml) of amitriptyline, bupivacaine, chlorpromazine, disopyramide, imipramine, meperidine, nortriptyline, propranolol and quinidine were added. LFF was determined by equilibrium dialysis at an initial lidocaine concentration of 2.0 micrograms/ml. LFF increased from 0.30 +/- 0.019 (mean +/- SD) in the absence of displacing agents to maximum values ranging from 0.59 (nortriptyline) to 0.73 (bupivacaine). Plots of LFF vs. the logarithm of displacing drug concentration yielded simple sigmoidal curves in all cases. LFF was increased 50% by an initial bupivacaine concentration of 6.0 micrograms/ml with all other drugs requiring more than 10 micrograms/ml to increase LFF to that extent. Lidocaine binding in a 4.5 g/dl albumin solution was unaffected by concentrations of quinidine, meperidine, nortriptyline and bupivacaine up to 200 micrograms/ml. Addition of AAG to serum reduced LFF as expected. A plot of the reciprocal of bound drug concentration vs. the reciprocal of free drug concentration in the presence and absence of quinidine suggested a competitive binding interaction. These data indicate that the binding interactions between lidocaine and the various displacing compounds are not significantly complicated by cooperative effects and that, with the possible exception of bupivacaine, displacement of lidocaine by any of these drugs is likely to be of clinical significance.

journal_name

Eur J Clin Pharmacol

journal_title

European journal of clinical pharmacology

authors

Goolkasian DL,Slaughter RL,Edwards DJ,Lalka D

doi

10.1007/BF01037957

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

413-7

issue

3

eissn

0031-6970

issn

1432-1041

journal_volume

25

pub_type

杂志文章

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