Behavior: Toddler, Benadryl

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Zyrtec and Behavior

I have a 6 year old daughter who has allergies which seem to crop up this summer. I've given her Zyrtec for the last few weeks and am noticing some horrible behavior changes in her. I am wondering if anyone else has had this experience and if they could be related. She has always been an independent child, but this is a whole new level of bad behavior. I just started to wonder if it could be the Zyrtec. This is her first time on Allergy Meds.