Objective: To analyze the correlation between drug exposure (AUC0-4) and blood concentration of different sample points during Neoral absorption phase in Chinese adult liver transplant recipients, and to evaluate the possibility of using post-dose 2 hour level (C2) as a surrogate marker of AUC0-4 for the therapeutic drug monitoring (TDM) of Neoral.
Methods: Neoral levels at 0, 1, 2, 3, and 4 hours (C1, C2, C3, C4) after morning dose of 22 de novo Chinese adult liver transplant recipients were monitored during different posttransplant periods. Liner regression was used to analyze the correlation between CsA concentration at different time points and the AUC0-4.
Results: The best correlation was found at C2, while the correlation of C0 was the lowest. During following-up, the correlation between C2 and AUC0-4 was very stable.
Conclusion: C2 had the best correlation with drug exposure. This correlation is very stable. C2 may be used as a good surrogate marker of AUC0-4 for the TDM of Neoral.
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