The treatment is confusing as it says tabs are not safe during breastfeeding so how are they safe during pregnancy?
it's based on the drugs molecule size and whether it can pass the placental barrier. Just because it can pass into breast milk, doesn't mean it will pass through the placenta onto the baby, if that makes sense. If the drug is Carbimazole (Neo-mercazole is a trade name), that's not usually used in pregnancy if it can be avoided, but there is another drug that's safe in pregnancy. They just registered it in NZ last year but I can't remember what it was called sorry.
I hope that gives you some insight/comfort, hopefully Eranda will see this and can give you a little more on what the treatment usually is in Aus.