Depends. There are many allergy medications available for children. New generation antihistamines such as zyrtec, allegra, claritin, xyzal, (levocetirizine) and clarinex, are very well tolerated and effective. Nasal steroid sprays are more effective and Nasonex is approved to age 2 years old. Singulair is approved for allergies as well as asthma. With all of these options, there is a good fit for almost all children.