Summary of Use during Lactation

No information is available on the clinical use of lapatinib during breastfeeding. Because lapatinib is more than 99% bound to plasma proteins, the amount in milk is likely to be low. However, its half-life is about 24 hours and it might accumulate in the infant. It is also given in combination with capecitabine, which may increase the risk to the infant. The manufacturer recommends that breastfeeding be discontinued during lapatinib therapy and for 1 week after the last dose.

Drug Levels

Maternal Levels. Relevant published information was not found as of the revision date.

Infant Levels. Relevant published information was not found as of the revision date.

Effects in Breastfed Infants

Relevant published information was not found as of the revision date.

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.

Substance Name

Lapatinib

CAS Registry Number

231277-92-2

Drug Class

• Breast Feeding
• Lactation
• Antineoplastic Agents
• Enzyme Inhibitors
• Protein Kinase Inhibitors
• Signal Transduction Inhibitors
• Tyrosine Kinase Inhibitors