Answer
Grapefruit juice should be avoided during Tyverb treatment because it may inhibit CYP3A4 in the gut wall and increase the bioavailability of lapatinib.
Sources for this answer
- Tyverb film-coated tabletsNovartis Pharmaceuticals UK Ltd · emc · SmPC §4.5 Interaction with other medicinal products · Version 34Document updated
Sources checked