Predictive performance of population pharmacokinetic parameters of tianeptine as applied to plasma concentrations from a post-marketing study
Grasela TH, Fiedler-Kelly JB,
Salvadori C, Marey C, Jochemsen R, Loo H.
Center for Pharmacoepidemiology Research,
University at Buffalo, New York.
Eur J Clin Pharmacol. 1993;45(2):123-8.
ABSTRACTThe predictive ability of population pharmacokinetic parameters of tianeptine, obtained from a mixed effect analysis of pre-marketing pharmacokinetic studies, was evaluated using tianeptine plasma concentrations obtained during a large multi-center post-marketing surveillance study. The mean prediction error was 7.8 ng.ml-1 and the root mean square prediction error was 52.1 ng/ml when initial estimates of population pharmacokinetic parameters were used to predict drug concentrations in one half of the post-marketing data. When the population parameters were revised to reflect the data collected in the first half of the post-marketing study, the mean prediction error was reduced to -3.2 ng.ml-1 and the root mean square prediction error was reduced to 29.5 ng.ml-1. These results suggest that population pharmacokinetic parameters obtained from pre-marketing data may not accurately predict drug concentrations in patients receiving the drug in the post-marketing setting. Once the population parameters are updated to reflect data from the post-marketing period, the predictive ability of the data-base increases, but substantial variability in the prediction error remains.Cats
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