Original Article

Pharmacokinetics of 5-fluorouracil and its penetration into pancreatic juice in dogs

Authors: Zhu Zhu, Qiang Fu, Charles H Nightingale, Yu-Pei Zhao, Quan Liao, Hong-Na Wang, Chang-Qing Xue, Zhi-Ying Yang, Da-Kui Li


AIM: To study the pharmacokinetic behavior of 5-fluorouracil (5-FU) in pancreatic juice in dogs and its correlation with 5-FU in plasma, and to evaluate its penetration characteristics.
METHODS: After placing a pancreatico-drainage tube, 8 dogs were injected 5-FU 250 mg i.v. Blood and pancreatic samples were collected and the 5-FU concentrations were determined by HPLC. The pharmacokinetic parameters were obtained with statistical analysis.
RESULTS: The mean slopes of the terminal phase (K10) in plasma and pancreatic juice were 9.4 h-1 and 10.2 h-1, respectively (P > 0.05). The pharmacokinetic behaviors of 5-FU in plasma and pancreatic juice fitted a nonlinear model. Its penetration index was 3.39 +/- 2.84. The penetration of 5-FU from blood to pancreatic juice was relatively rapid, demonstrating a consistently higher concentration in pancreatic juice than in plasma.
CONCLUSIONS: The elimination phase of 5-FU in plasma was similar to that in pancreatic juice, indicating that they were in the same kinetic compartment.

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