A rare case of methotrexate and primaquine co‐administration in a mantle cell lymphoma patient
2019
WHAT IS KNOWN AND OBJECTIVE: High-dose methotrexate (HD-MTX) is associated with a plethora of adverse drug reactions and potential drug interactions (DIs). But there is a paucity of information regarding the safety of co-administering primaquine with HD-MTX. CASE SUMMARY: A 65-year-old male patient was diagnosed with mantle cell lymphoma (MCL) with CNS involvement and treated with three cycles of IV HD-MTX. His case was further complicated by fungal pneumonia treated with primaquine during cycle-2. Serial blood sampling and subsequent population pharmacokinetics (PK) modelling suggests a possible distribution-mediated DI between the two drugs. WHAT IS NEW AND CONCLUSION: This is the first case report to highlight the safe co-administration of MTX and primaquine, despite a possible PK interaction.
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