My pediatrician just suggested that my 6 yr old daughter switch from Zyrtec to Clarinex for allergies.  I asked him about whether the Clarinex tablet would have any lactose.  He said he didn't know but that it wouldn't be enough to make a difference.  (We're fairly new to the area, so he's never seen first hand her reaction to milk exposure ... throat swells, hives, asthma).  

I gave her the Clarinex and within 30 minutes she said she felt like she was going to throw up.  I gave her Atarax (our normal response to milk exposure) and she seemed fine within 30 minutes.  I checked the Clarinex website (it does contain lactose monohydrate) and called the doc.  He again said that it wasn't enough to make a difference, but that he would call in a prescription for the Claritin syrup that was lactose free.  

I have trouble excepting the ... "not enough lactose to make a difference" theory.  Any thoughts or similar experiences out there?

Thanks,

Cathy (Mom to Hannah, age 6)