I get that cr*p every time I ask. The pat answers are either: 1) there's no protein, so it won't trigger allergic reaction 2) there's not enough lactose to make a difference. I find neither of these to be entirely true. I have symptoms when I eat/take anything with lactose and/or milk proteins in it. So does my son. It's the symptoms that are the true "test." I find it appalling that allergy medications are so often buffered in lactose, and that allergic reactions and diarrhea and related GI symptoms are so commonly listed as side effects. When will they get a clue!? In your specific case, you might want to consider Allergra tablets, which are lactose-free.