Bronchodilator of long-lasting action. At latest update no published data on excretion into breast milk were found. Terbutaline which is a compound closely related to Formoterol is excreted into breast milk in non-significant amount.Salmeterol, another compound with similar characteristics, is also non-significantly excreted. With a relatively high molecular weight, excretion into breast milk seems unlikely. Expert consensus states that the use of inhaled bronchodilators is compatible with breastfeeding due to a minimal absorption and low levels achieved in the mother's plasma. Inhaled therapy with bronchodilators is preferred since they use a lower dose (less likelihood of excretion into milk)