It is very improbable that acarbose passes into breastmilk. Enteral absorption of acarbose is extremely low : Only 2 % of the administered dosis.
There are no available studies about acarbose during breastfeeding. Caution should be taken if a mother takes acarbose during breastfeeding
Warning of the manufacturer:
The use of acarbose is contra-indicated in pregnancy and in nursing mothers.