New-generation antihistamines have been subjected to stricter studies and rules, and so their effects on children are better known.
However, even these drugs can have side effects, including the drowsiness that they're meant to exclude.
And if your child reacts negatively to one, ask your doctor for an antihistamine with a different active ingredient.
Non sedating antihistamine syrup
Piriteze allergy syrup contains cetirizine 1mg/1ml. It is licensed for children aged six years and over and adults.
Piriteze allergy syrup contains the active ingredient cetirizine hydrochloride, which is a type of medicine called a non-sedating antihistamine.
They are meant to be non-sedative (or at least less so), and they last long enough that you only have to take one or two doses per day.
Popular brands include Allecet, Zyrtec and Clarityne.
Cetirizine works by preventing the actions of histamine - a substance produced by the body when it reacts to a foreign substance, such as pollen or pet fur (these are known as allergens).