both are antihistamines and both are safe for children of his age if the proper dose is given. zyrtec lasts much longer; benadryl lasts only about four hours.
my doctor said to give benedryl to my son for his hives and the babysitter gave him zyrtec. is this an issue? . he has an appointment with the allergy doctor tomorrow to possibly do allergy testing. is it going to cause an issue. he is 4 years old and weighs 34. 8lbs. they gave him 3/4 tsp.