Objective:
The method of administering the initial doses of tacrolimus in recipients of pediatric
lung transplantation, especially in patients with low hematocrit, is not clear. The present study aims to explore
whether weight, CYP3A5 genotype, and voriconazole co-administration influence tacrolimus initial dosage in
recipients of pediatric lung transplantation with low hematocrit based on safety and efficacy using a simulation
model.
Methods:
The present study utilized the tacrolimus population pharmacokinetic model, which was employed
in lung transplantation recipients with low hematocrit.
Results:
For pediatric lung transplantation recipients not carrying CYP3A5*1 and without voriconazole, the recommended
tacrolimus doses for weights of 10-13, 13-19, 19-22, 22-35, 35-38, and 38-40 kg are 0.03, 0.04,
0.05, 0.06, 0.07, and 0.08 mg/kg/day, which are split into two doses, respectively. For pediatric lung transplantation
recipients carrying CYP3A5*1 and without voriconazole, the recommended tacrolimus doses for
weights of 10-18, 18-30, and 30-40 kg are 0.06, 0.08, 0.11 mg/kg/day, which are split into two doses, respectively.
For pediatric lung transplantation recipients not carrying CYP3A5*1 and with voriconazole, the recommended
tacrolimus doses for weights of 10-20 and 20-40 kg are 0.02 and 0.03 mg/kg/day, which are split into
two doses, respectively. For pediatric lung transplantation recipients carrying CYP3A5*1 and with voriconazole,
the recommended tacrolimus doses for weights of 10-20, 20-33, and 33-40 kg are 0.03, 0.04, and 0.05
mg/kg/day, which are split into two doses, respectively.
Conclusion:
The present study is the first to recommend the initial dosages of tacrolimus in recipients of pediatric
lung transplantation with low hematocrit using a simulation model.