High-dose cytarabine is recommended for re-induction chemotherapy in patients less than 60 years of age with acute myelogenous leukemia. This case describes a patient receiving high-dose cytarabine for re-induction and subsequently developed tingling and numbness in her hands and feet followed by severe pain, swelling, and erythema consistent with a diagnosis of palmar-plantar erythrodysesthesia. Furthermore, the patient's hemoglobin, platelets, and neutrophils did not recover after over 30 days post high-dose cytarabine. The patient was concurrently receiving posaconazole for fungal prophylaxis which was initiated after the induction therapy. We speculate that posaconazole may inhibit the cytarabine efflux through P-glycoprotein inhibition leading to the patient's palmar-plantar erythrodysesthesia and subsequent aplasia. Future pharmacokinetic studies need to be conducted to ascertain if posaconazole does influence the pharmacokinetics of cytarabine.
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