Re:
Let's say you're pregnant, and you have a cold, so you take
pseudoephedrine.  You're not breastfeeding yet, but can the drug interfere
with milk production after you give birth?  How long before you give birth
might it affect milk production?  Can it affect colostrum production?
The answer is five half-lives, which would be up to approximately 24 hours after you stop taking pseudoephedrine.
Yes; it could affect colostrum production if taken during that time.
I doubt any mother giving birth would be taking pseudoephedrine during that time, in any case.


Frank J. Nice, RPh, DPA, CPHP



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