At latest update no published data were found on excretion into breast milk. Its high plasma protein-binding capacity makes it unlikely the passage to the milk, however, it has a very long elimination time. It can cause QT prolongation on the EKG and serious cardiac arrhythmias. It has been withdrawn from the market in many countries. During breastfeeding an alternative drug that is known to be safer is preferred, especially during the neonatal period and in case of a premature infant.