Patients with moderate to severe hepatic impairment
There are limited data in patients with moderate hepatic impairment and no data in patients with severe hepatic impairment. IVEMEND should be used with caution in these patients (see section 5.2).
CYP3A4 interactions
IVEMEND should be used with caution in patients receiving concomitant active substances that are metabolised primarily through CYP3A4 and with a narrow therapeutic range, such as cyclosporine, tacrolimus, sirolimus, everolimus, alfentanil, diergotamine, ergotamine, fentanyl, and quinidine (see section 4.5). Additionally, concomitant administration with irinotecan should be approached with particular caution as the combination might result in increased toxicity.
Co-administration of fosaprepitant with ergot alkaloid derivatives, which are CYP3A4 substrates, may result in elevated plasma concentrations of these active substances. Therefore, caution is advised due to the potential risk of ergot-related toxicity.
Concomitant administration of fosaprepitant with active substances that strongly induce CYP3A4 activity (e.g. rifampicin, phenytoin, carbamazepine, phenobarbital) should be avoided as the combination could result in reductions of the plasma concentrations of aprepitant (see section 4.5). Concomitant administration of fosaprepitant with herbal preparations containing St. John's Wort (Hypericum perforatum) is not recommended.
Concomitant administration of fosaprepitant with active substances that inhibit CYP3A4 activity (e.g. , ketoconazole, itraconazole, voriconazole, posaconazole, clarithromycin, telithromycin, nefazodone, and protease inhibitors) should be approached cautiously as the combination is expected to result in increased plasma concentrations of aprepitant (see section 4.5).
Co-administration with warfarin (a CYP2C9 substrate)
Co-administration of oral aprepitant with warfarin results in decreased prothrombin time, reported as International Normalised Ratio (INR). In patients on chronic warfarin therapy, the INR should be monitored closely for 2 weeks following the use of fosaprepitant for the prevention of chemotherapy induced nausea and vomiting (see section 4.5).
Co-administration with hormonal contraceptives
The efficacy of hormonal contraceptives may be reduced during and for 28 days after administration of fosaprepitant. Alternative or back-up methods of contraception should be used during treatment with fosaprepitant and for 2 months following the use of fosaprepitant (see section 4.5).
Hypersensitivity reactions
Isolated reports of immediate hypersensitivity reactions including flushing, erythema, and dyspnea have occurred during infusion of fosaprepitant. These hypersensitivity reactions have generally responded to discontinuation of the infusion and administration of appropriate therapy. It is not recommended to reinitiate the infusion in patients who experience hypersensitivity reactions.
Administration and infusion site reactions
IVEMEND should not be given as a bolus injection, but should always be diluted and given as a slow intravenous infusion (see section 4.2). IVEMEND should not be administered intramuscularly or subcutaneously (see section 5.3). Mild injection site thrombosis has been observed at higher doses (see section 4.9). If signs or symptoms of local irritation occur, the injection or infusion should be terminated and restarted in another vein.
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