To: Sarah Augustine Re: Clarithromycin(Biaxin) As per your question on Biaxin(clarithromycin). This is a macrolide antiobiotic just like erythromycin, Zithromax, and others. The only likely problem associated with these antibiotics is an upset stomach and maybe a little diarrhea. Unfortunately, we don't have any studies yet on Biaxin in Bfing moms, although it is good to remember that Biaxin is cleared for pediatric use, including neonates. Next time, you might suggest using Zithromax(Azithromycin). It has the same spectrum and useage as the other macrolides, and we now have a good study showing that milk levels are extremely low( 0.6 to 2.8 mg/Liter of milk) following a dose of 500 mg daily. This is a good product and good news for use BF supporters. I seriously doubt that Biaxin would produce any untoward effecs in a breastfeeding infant. *********************************** T.W. Hale, Ph.D. ***********************************