Assessments of CYP‑inhibition‑based drug-drug interaction between vonoprazan and poziotinib and .

Context: Poziotinib and vonoprazan are two drugs mainly metabolized by CYP3A4. However, the drug-drug interaction between them is unknown.

Objective: To study the interaction mechanism and pharmacokinetics of poziotinib on vonoprazan.

Materials And Methods: experiments were performed with rat liver microsomes (RLMs) and the contents of vonoprazan and its metabolite were then determined with UPLC-MS/MS after incubation of RLMs with vonoprazan and gradient concentrations of poziotinib. For the experiment, rats in the poziotinib treated group were given 5 mg/kg poziotinib by gavage once daily for 7 days, and the control group was only given 0.5% CMC-Na. On Day 8, tail venous blood was collected at different time points after the gavage administration of 10 mg/kg vonoprazan, and used for the quantification of vonoprazan and its metabolite. DAS and SPSS software were used for the pharmacokinetic and statistical analyses.

Results: experimental data indicated that poziotinib inhibited the metabolism of vonoprazan (IC = 10.6 μM) in a mixed model of noncompetitive and uncompetitive inhibition. The inhibitory constant K was 0.574 μM and the binding constant αK was 2.77 μM. experiments revealed that the AUC (15.05 90.95 μg/mL·h) and AUC (15.05 91.99 μg/mL·h) of vonoprazan increased significantly with poziotinib pretreatment. The MRT of vonoprazan increased from 2.29 to 5.51 h, while the CLz/F value decreased from 162.67 to 25.84 L/kg·h after pretreatment with poziotinib.

Conclusions: Poziotinib could significantly inhibit the metabolism of vonoprazan and more care may be taken when co-administered in the clinic.