Jay: I only know about this drug since it is in my medicine cabinet for my three year old when she has a bad cold. It is a mixture of 50mg Guaifenisin, 5mg Dextromethorphan, and 6.25mg phenylpropanalomine in each 1ml (in other words, expectorant, coughsuppressant and decongestant). The phenyl... part of it is the same active ingredient in Dexatrim. Hale says it can be expected to transfer into breastmilk, "observe for excitement, loss of appetite, insomnia" (p.315 '96 edition). It is not AAP reviewed. I would think that, depending on the age of the baby and the extent of the mom's symptoms, it might be a good idea to investigate another decongestant. Lisa Jones, LLLL in Wellington FL