I took allergy shots throughout my childhood and adolescence. One thing to check, the doctor I went to as a child had both pediatric and adult crash carts in his office and an ambulance on speed dial. I was a very reative patient and I never needed those things but I think that it was good that they were there just in case. If your child is very reactive, you might want to ask about emergency plans. You definitely do not want to find out that they are not prepared for a serious emergency during one.