The pharmacokinetics of ceftriaxone based on population pharmacokinetics and the prediction of efficacy in Japanese adults.

Abstract:

OBJECTIVE:By using a population pharmacokinetic analysis method, we predicted the efficacy of Ceftriaxone (CTRX) based on the pharmacokinetics of CTRX in Japanese adults and the sensitivity of infective organisms to CTRX in 2004. In addition, we clarified the difference in efficacy between once-a-day administration and twice-a-day administration. METHODS:The population pharmacokinetic analysis was based on the serum concentrations of CTRX already published by NONMEM. The possible effect of body weight and age on the pharmacokinetics of CTRX was examined using a model which incorporated the change of a specific protein-binding ratio of CTRX. A Monte Carlo simulation was conducted based on the population pharmacokinetic parameters obtained by this analysis, and thereby the time above MIC (TAM) was determined from the MIC values of CTRX administered once at 0.5, 1, and 2 g and twice at 1 g. The efficacy ratio was predicted from the TAM thus obtained. RESULTS:Because the time course of serum concentration of CTRX in adult subjects was fitted to a 2-compartment model and both body weight and age were not incorporated as the covariate, the dosing method by which a fixed amount of CTRX is administered to patients has been thought to be adequate. Based on the efficacy ratio estimated from the MIC of CTRX, we have predicted that the once-a-day administration of CTRX even at 0.5g is effective on various infecting organisms.

authors

Iida S,Kinoshita H,Kawanishi T,Hayashi M

doi

10.1007/BF03191159

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

107-15

issue

2

eissn

0378-7966

issn

2107-0180

journal_volume

34

pub_type

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