The aim of this study was to develop a population pharmacokinetic model for piperacillin\n(PIPC)/tazobactam (TAZ) in late elderly patients with pneumonia and to optimize the administration\nplanning by applying pharmacokinetic/pharmacodynamic (PK/PD) criteria. PIPC/TAZ (total dose\nof 2.25 or 4.5 g) was infused intravenously three times daily to Japanese patients over 75 years\nold. The plasma concentrations of PIPC and TAZ were determined using high-performance liquid\nchromatography and modeled using the NONMEM program. PK/PD analysis with a random\nsimulation was conducted using the final population PK model to estimate the probability of\ntarget attainment (PTA) profiles for various PIPC/TAZ-regimenâ??minimum-inhibitory-concentration\n(MIC) combinations...............
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