i do not recommend giving your child benadryl on top of zyrtec. they are both antihistamines and will individually have the coverage your child needs for allergy relief. however you need to partner with your pediatrician or other health-care providers to make sure this dose is safe and effective for your child. both medications are readily available over the counter but for self-use the directions on the box/bottle/package must be followed.
can a 4 1/2-year-old taking zyrtec daily also take a dose of benadryl on the same day?