No information is available on the use of febuxostat during breastfeeding. Because febuxostat is more than 99% bound to plasma proteins, the amount in milk is likely to be low. Furthermore, oral bioavailability is only about 50%, so the amount an infant receives systemically is expected to be very small. If febuxostat is required by the mother, it is not a reason to discontinue breastfeeding; however, until more data become available, an alternate drug may be preferred.