Zyrtec help !!

I am scared to give my 3 year old children’s Zyrtec. I just get anxious about how he will react to it I guess & I don’t want it to make him drowsy bc his sleep schedule has been so much better lately. But he suffers from eczema that he has an ointment for, he wakes up coughing a lot, he’s always itching & sneezes everyday. So I know this could really help him being outside during the summertime.

Anyone have experience giving their toddler Zyrtec??

Thank you!!