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Erlotinib and pantoprazole: a relevant interaction or not?
Author(s) -
Ter Heine Rob,
Fanggiday James C.,
Lankheet Nienke A. G.,
Beijnen Jos H.,
Van Der Westerlaken Monique M. L.,
Staaks Gerald H. A.,
Malingré Mirte M.
Publication year - 2010
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.2010.03748.x
Subject(s) - erlotinib , pantoprazole , medicine , pharmacology , dosing , drug interaction , therapeutic drug monitoring , proton pump inhibitor , pharmacokinetics , omeprazole , epidermal growth factor receptor , cancer
AIMS There is increasing evidence that erlotinib exposure correlates well with treatment outcome. In this report we present a case of therapeutic drug monitoring of erlotinib in a patient with a gastric ulcer, treated with the proton pump inhibitor pantoprazole. This agent may cause an unwanted, but not always unavoidable, interaction since absorption of erlotinib is pH dependent. METHODS Erlotinib trough concentrations were monitored in a patient during treatment with orally and intravenously administered pantoprazole. RESULTS Erlotinib trough concentrations were diminished during high dose intravenously administered pantoprazole, but returned to normal when the dose was reduced and pantoprazole was administered orally. CONCLUSIONS More studies are needed to assess the dose dependency of the interaction between pantoprazole and erlotinib. Furthermore, we advise to monitor closely erlotinib plasma concentrations and adjust the erlotinib dose accordingly when a clinically relevant interaction is suspected and no proper dosing guidelines are available.