Erythromycin is the right spelling I believe...It is not contrindicated during BF. In fact it is the choice therapy for adenitis (infection of the ducts) becuse it passes into breastmilk. Only one concern: if BB is under one month of age there seems to be some concern with increased jaundice. Could Dr. Hale comment? Dany Gauthier IBCLC [log in to unmask] Tel: 514-923-3792 Fax:514-923-3802