Abstract
Many orally administered, small-molecule, targeted anticancer drugs, such as dasatinib, exhibit pH-dependent solubility and reduced drug exposure when given with acid-reducing agents. We previously demonstrated that betaine hydrochloride (BHCl) can transiently re-acidify gastric pH in healthy volunteers with drug-induced hypochlorhydria. In this randomized, single-dose, three-way crossover study, healthy volunteers received dasatinib (100 mg) alone, after pretreatment with rabeprazole, and with 1500 mg BHCl after rabeprazole pretreatment, to determine if BHCl can enhance dasatinib absorption in hypochlorhydric conditions. Rabeprazole (20 mg b.i.d.) significantly reduced dasatinib Cmax and AUC0-∞ by 92 and 78%, respectively. However, coadministration of BHCl significantly increased dasatinib Cmax and AUC0-∞ by 15- and 6.7-fold, restoring them to 105 and 121%, respectively, of the control (dasatinib alone). Therefore, BHCl reversed the impact of hypochlorhydria on dasatinib drug exposure and may be an effective strategy to mitigate potential drug-drug interactions for drugs that exhibit pH-dependent solubility and are administered orally under hypochlorhydric conditions.
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Acknowledgments
The authors would like to acknowledge the staff and nurses of the UCSF-CCRC for their assistance in this study. The UCSF-CCRC is supported by an NIH/NCRR grant (UL1 RR0224131). This study was supported by a grant from Genentech, Inc., and M. R. Yago was supported in part by NIH Training Grant T32 GM007175.
Conflict of Interest
L. Z. Benet is a consultant for Genentech, Inc., and X. Ding, B. Dean, L. Salphati, N. Budha, J. Y. Jin, M. J. Dresser, and J. A. Ware are employees of Genentech, Inc.
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Yago, M.R., Frymoyer, A., Benet, L.Z. et al. The Use of Betaine HCl to Enhance Dasatinib Absorption in Healthy Volunteers with Rabeprazole-Induced Hypochlorhydria. AAPS J 16, 1358–1365 (2014). https://doi.org/10.1208/s12248-014-9673-9
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DOI: https://doi.org/10.1208/s12248-014-9673-9