Drug Interaction Report

MONITOR: Coadministration with epcoritamab may increase the plasma concentrations of drugs that are substrates of CYP450 isoenzymes. Initiation of epcoritamab treatment causes transient release of cytokines that may suppress CYP450 isoenzymes, although the potential for an interaction has not been studied. According to the manufacturer, the highest drug-drug interaction risk would be from the first dose on the first day of cycle 1, up to 14 days after the first 48 mg dose on day 15 of cycle 1, as well as during and after cytokine release syndrome.

MANAGEMENT: Caution is advised when epcoritamab is administered with drugs that are metabolized by CYP450 isoenzymes, particularly those with a narrow therapeutic range, where minimal changes to concentration may lead to significant adverse reactions, such as carbamazepine, colchicine, cyclosporine, disopyramide, phenytoin, quinidine, theophylline, warfarin, macrolide immunosuppressants, vinca alkaloids, and some narcotic analgesics. Clinical and/or laboratory monitoring are recommended, particularly at the initial phase of treatment with epcoritamab as well as during and after cytokine release syndrome, and the dosage(s) of the CYP450 substrate(s) adjusted accordingly.