Fexofenadine can be used as an antihistamine during lactation if other antihistamines e.g., cetirizine and loratadine are not effective although studies are limited
Fexofenadine is being asked about frequently this year when symptoms of hayfever seem worse than usual. It can be bought over the counter (but the leaflet will say don’t take if breastfeeding and the pharmacist may suggest that it isn’t compatible with breastfeeding). I hope this information sheet helps you decide what is right for you and your baby.
Factsheet Fexofenadine and Breastfeeding