I recently had a mom call me b/c she was put on clarithromycin (Biaxin in the USA). Her doc said it was OK while breastfeeding and I agreed. Her doc also told her it might change the taste of her milk such that the baby wouldn't like it. I took clarithromycin once and had that 24 hour a day metallic after taste. A known side effect. Bad enough that I stopped the med. Hey it was for otitis which is usually self limiting in children so I figured it would be more so for adults. Anyway does anyone have info on the transfer of clarithromycin into milk? Is it enough to cause the after taste? -Rob Rob Cordes, DO, FAAP, FACOP Wilkes Barre, PA mailto: [log in to unmask]