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Aim: To investigate the population pharmacokinetics (PK) model of lithium carbonate in young male healthy Chinese subjects. Methods: This study was conducted using a 2-period crossover design. 20 healthy male subjects received lithium carbonate tablets from 2 different Chinese pharmaceutical manufacturers. Plasma samples were obtained by blood sampling over 72 h in each period. Population PK analysis was performed using nonlinear mixed-effects model (NONMEM) software. The final models were validated using bootstrap and visual predictive check (VPC) approaches. Results: The final PK model was a two-compartment model. The population PK parameters, clearance (CL/F), apparent distribution volume of the central compartment (V2/F), inter-compartmental clearance (Q/F) and apparent distribution volume of the peripheral compartment (V3/F), were 9.39 L/h, 10.4 L, 22.1 L/h, and 216 L, respectively. Conclusion: Population PK models for lithium carbonate have been developed and considerable inter-subject variability was found in healthy young male Chinese subjects. It takes a long time to achieve the steady state in conventional therapy. This may provide guidelines for future use of lithium carbonate in China.
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