Why someone wants to use this intra nasally I don't know.
However I called a pediatric pulmonologist the other day about using this
med fora 5 year old. Presently its approved down to 6 years old. He told me
that in a few weeks it will  have approval as young a 2 years old.
That should answer this particular breastfeeding question.
Merck or the FDA should be able to give the doctor more info.
Rob

Rob Cordes, DO
pediatrician
mailto:[log in to unmask]

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