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Sample reuse simulation in optimal design for Tmax in pharmacokinetic experiments

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Tmax and Cmax are important pharmacokinetic parameters in drug development processes. Often a nonparametric procedure is needed to estimate them when model independence is required. This paper proposes a simulation-based optimal design procedure for finding optimal sampling times for nonparametric estimates of Tmax and Cmax for each subject, assuming that the drug concentration follows a non-linear mixed model. The main difficulty of using standard optimal design procedures is that the property of the nonparametric estimate is very complicated. This procedure uses a sample reuse simulation to calculate the design criterion, which is an integral of multiple dimension, so that effective optimization procedures such as Newton-type procedures can be used directly to find optimal designs. This procedure is used to construct optimal designs for an open one-compartment model. An approximation based on the Taylor expansion is also derived and showed results that were consistent with those based on the sample reuse simulation.
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Keywords: Non-linear mixed models; Optimal design; Optimization; Sample reuse; Simulation; Tmax

Document Type: Research Article

Affiliations: University of Dundee, UK

Publication date: 2002-01-01

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