Indgift af lapatinib samtidig med kendte induktorer af CYP3A4 (fx rifampicin, rifabutin, carbamazepin, phenytoin eller perikum (hypericum perforatum)) bør undgås.
Coadministration of lapatinib with known inducers of CYP3A4 (e. g. rifampicin, rifabutin, carbamazepine, phenytoin or Hypericum perforatum [St John’ s wort]) should be avoided.