In the absence of information on the specific P450 isoenzymes involved, caution should be taken when co-prescribing active substances metabolised by this route such as, among others, anticonvulsants, rifabutin, rifampicin, griseofulvin and St. John’ s wort (Hypericum perforatum).
Ker ni poznano, kateri izoencimi P450 so vpleteni, je potrebna pazljivost pri sočasnem predpisovanju zdravilnih učinkovin, ki se presnavljajo po tej poti, med drugim tudi antikonvulzivov, rifabutina, rifampicina, grizeofulvina in šentjanževke (Hypericum perforatum).