Drug Interaction Report

GENERALLY AVOID: Coadministration with erdafitinib may increase the plasma concentrations of drugs that are substrates of the P-glycoprotein (P-gp) efflux transporter, resulting in increased toxicity of these drugs. In vitro, erdafitinib has been shown to be an inhibitor of P-gp. However, no pharmacokinetic data are available from drug interaction studies.

MANAGEMENT: Concomitant use of erdafitinib and P-gp substrates should generally be avoided. If concomitant use is required, administer erdafitinib at least 6 hours before or after administration of P-gp substrates with narrow therapeutic ranges.

ADJUST DOSING INTERVAL: Consumption of food can decrease the rate and extent of gastrointestinal absorption of sirolimus. Also, the consumption of grapefruit juice may result in increased sirolimus trough concentrations.

MANAGEMENT: Experts recommend that this drug be taken either at least one hour prior to eating or consistently with or without food to avoid variations in sirolimus blood levels. The manufacturer recommends against using grapefruit juice for dilution of sirolimus doses. Patients should be monitored for clinical and laboratory evidence of altered immunosuppressant effects.