It dries up your milk supply. I wouldn't personally take that risk so that's a no from me!

In small doses and after your supply is regulated. But before that or long prolonged use can in fact affect your milk supply. I was told by the pediatrician to not use anything with Benadryl in it when I came down with a cold when my baby was a week old.

Thanks

From kellymom: Many forms of Robitussin, Delsym and Benylin are considered compatible with breastfeeding. Always check the active ingredients, as there are many versions.

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Edit: great minds @lu? we must have posted at the same time

From kellymom:

Mom’s use of sedating antihistamines (including Benadryl and Chlor-Trimeton products) are generally regarded to be compatible with breastfeeding, but always double-check the active ingredients as they can vary greatly. Monitor your infant for possible drowsiness if you use this type of antihistamine. The non-sedating antihistamines (below) are generally preferred and are less likely to sedate baby.

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