Hi
Dd2 aged 4.10 has been prescribed cetrizine at 10ml per day as the doctors feel she has chronic urticaria & angiodema in addition to her allergies.
Her behaviour has really changed for the worse which can be linked to starting the medication - but can also be linked to the start of the school holidays...
A quick google shows other people reporting behavioural change linked to cetrizine.
Anyone else??