TY - JOUR AB - Pediatric patients with systemic‑onset juvenile idiopathic arthritis (SOJIA) may be treated with tacrolimus. However, the therapeutic range for tacrolimus is narrow with considerable inter‑ and intra‑individual variability, making it difficult to formulate an ideal dosage regimen for personalized treatment. The purpose of the present study was to set up a population pharmacokinetics (PPK) model of tacrolimus treatment for SOJIA to determine the optimal initial dosage. Patients with SOJIA were analyzed using non‑linear mixed‑effects modeling. Different regimens were analyzed using Monte Carlo simulation with concentration profiles. A first‑order absorption and elimination one‑compartment model was selected as the most appropriate model for SOJIA. Based on initial dosage recommendations, the regimen of 0.5 mg every 24 h (q24h) appeared to be most suitable for subjects with a body weight of 5 kg, while the 0.5 mg q12h regimen was most suitable for subjects with a body weight of 15‑25 kg, the 1/0.5 mg q24h regimen was appropriate for the 26‑35 kg group and the 1 mg q12h regimen was suitable for the subjects with a body weight of 36‑50 kg. To the best of our knowledge, the present study established the first PPK model of tacrolimus treatment that may be used for the selection of the initial dose based on body weight of pediatric patients with SOJIA. AD - Department of Pharmacy, Children's Hospital of Fudan University, Shanghai 201102, P.R. China Department of Nephrology and Rheumatology, Children's Hospital of Fudan University, Shanghai 201102, P.R. China AU - Wang,Dongdong AU - Chen,Xiao AU - Xu,Hong AU - Li,Zhiping DA - 2019/12/01 DO - 10.3892/etm.2019.8129 EP - 4660 IS - 6 JO - Exp Ther Med KW - personalized medicine population pharmacokinetics systemic‑onset juvenile idiopathic arthritis tacrolimus initial dosage recommendations PY - 2019 SN - 1792-0981 1792-1015 SP - 4653 ST - Population pharmacokinetics of tacrolimus in pediatric patients with systemic‑onset juvenile idiopathic arthritis: Initial dosage recommendations T2 - Experimental and Therapeutic Medicine TI - Population pharmacokinetics of tacrolimus in pediatric patients with systemic‑onset juvenile idiopathic arthritis: Initial dosage recommendations UR - https://doi.org/10.3892/etm.2019.8129 VL - 18 ER -