Evaluation of the Effects of Apatinib on the Pharmacokinetics of Venlafaxine and O-desmethylvenlafaxine in SD Male Rats by UPLC-MS/MS.

The objective of this study was to evaluate the effect of apatinib on the pharmacokinetics of venlafaxine and O-desmethylvenlafaxine in SD rats and the inhibitory effects of apatinib on venlafaxine in rat and human liver microsomes. Twenty-one SD male rats were randomly divided into three groups (n = 7): group A (multiple dose of 40 mg/kg apatinib for 7 days), group B (single dose of 40 mg/kg apatinib) and group C (the control group). All samples were measured by UPLC-MS/MS. The results indicated that a single dose of apatinib increased the AUC(0-t) , AUC(0-∞) and Cmax of both venlafaxine and O-desmethylvenlafaxine significantly, while Vz/F and CLz/F were decreased. As for group A, only AUC(0-t) and CLz/F of venlafaxine were changed, while no parameters of O-desmethylvenlafaxine were altered. In addition, apatinib was determined to be a mixed inhibitor of venlafaxine.