I am writting regarding. Dr. Hale's posting on pseudophedrine. As I mentioned before, I used The Nursing Mother's Companion as my resource for this one. She does say that pseudophedrine is a decongestant. She says that not much is known about their passage into milk, but that they can decrease "milk flow." It is unclear (to me) what her refrence source for this is. I hope this helps! Anne McDermott