Hyppig koncentrationsmåling af immunosuppressanten anbefales indtil niveauet er stabiliseret, idet plasmakoncentrationen af cyklosporin, rapamycin og tacrolimus kan være forhøjet, når stofferne administreres sammen med fosamprenavir og ritonavir.
Immunosuppressants: frequent therapeutic concentration monitoring of immunosuppresant levels is recommended until levels have stabilised as plasma concentrations of cyclosporin, rapamycin and tacrolimus may be increased when co-administered with fosamprenavir with ritonavir.