The only safe anti-allergic during lactation.Looking for this antiallergi as my daughter is nursing a baby ## What country are you in? Terfenadine, formerly sold under the trade name Seldane was discontinued on the U.S. market in 1997, due to the dangers of serious heart complications it could cause as a side effect. Canada pulled the drug in 1999 for the same reasons and it has also been removed from the U.K. market. That said, because of the dangers it causes, I definitely do not think any doctor would recommend its use for a nursing mother. You can read the details here: Has she spoken to her doctor about needing something to use?