Serum levels are usually very low because a low absorption by inhalation (<5%). Because a high serum protein-binding capacity, excretion into breast milk is unlikely. No harm effects have been found among breastfed babies whose mothers were receiving this medication. Most expert's opinion is that topical, oral or inhaled steroid medication is compatible with breastfeeding, WHO Model List of Essential Drugs 2002 rates it as compatible with breastfeeding.