What is known about salmeterol xinafoate excretion into breast milk and the potential risk to a breastfed child?

Animal data show salmeterol xinafoate is excreted in milk, and risk to a breastfed child cannot be excluded; whether to stop breastfeeding or discontinue/avoid Serevent therapy must be decided by weighing breastfeeding benefits for the child against treatment benefits for the woman.