Hi there AnnaT,

One thing you should understand with regards to medications and breastfeeding is that all pharmaceutical companies will recommend that you do not breastfeed while taking them if any of the drug or any of its byproducts can be detected in breastmilk during trials, even if the byproducts that are detected are not harmful to the baby.

As a result, nearly every single drug that is available recommends that you do not breastfeed while taking it.

Back in 2001, a paper was published in the Amercian Academy of Family Physicians reviewing a number of commonly used drugs and their effect on breastfeeding. I quote from that:

Propranolol, metoprolol and labetalol are safe to use while breast-feeding even if the infant is compromised.
Presolol is the trade name for labetolol. The entire paper can be found at: http://www.aafp.org/afp/20010701/119.html

As a result, I would suspect that there is sufficient evidence to continue using Presolol during breastfeeding without any fears of causing harm to your baby, despite the manufacturers over-zealous precautions.

Regards,

Michael

(Please note - I am a nurse, not a medical officer, so this advice should be considered withn that in mind, and if you have any further queries I strongly suggest you take them up with your obstetrician, please don't sue me, etc. etc. :-D)