Long-acting bronchodilator with a similar action than Salmeterol. At latest update no published data on excretion into breast milk were found. Plasma concentration after having inhaled bronchodilators is very low, so that a significant amount in the breast milk is not expected (Ellsworth 1994, McDonald 1996).Its low oral bioavailability hinders the passage from ingested milk towards the infant’s plasma, except in preterm babies and immediate neonatal period, which may show an increased intestinal permeability. Terbutaline, a molecule of the same family, is excreted in insignificant amounts in breast milk (Lindberg 1984). Inhaled bronchodilators are preferred because of their lower doses (less risk of excretion into milk).