Concurrent use with CYP3A4 inhibitors (e.g. clarithromycin, troleandomycin, diltiazem, verapamil, itraconazole, ketoconazole, nefazodone, ritonavir, nelfinavir) may lead to increased plasma levels of Aprepitant; concurrent use with CYP3A4 inducers (e.g. carbamazepine, phenytoin, rifampicin, primidone, phenobarbital) may lead to reduced efficacy of Aprepitant. May decrease concentrations of CYP2C9 substrates e.g. phenytoin, tolbutamide, warfarin. May increase plasma levels of dexamethasone and methylprednisolone. May increase plasma levels of benzodiazepine (e.g. midazolam, diazepam, alprazolam). Serum concentrations of colchicine may increase with Aprepitant. May increase toxicity of chemotherapy drug metabolised by CYP3A4 e.g. docetaxel, etoposide, ifosfamide, imatinib, paclitaxel, vincristine, vinblastin. May increase levels of ergot derivatives...
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