I gave my children children claritin at 6:00 am and just gave them children benadryl (diphenhydramine) at 8:00 pm. should i we worried?

Antihistamines: Assuming the doses of Claritin & Benadryl (diphenhydramine) were right for each child's age/weight, only possible concern might be sedation (even though Claritin is promoted as non-sedating. Each drug works on a different antihistamine receptor, so there shouldn't be any interactions, just improved symptom relief. Also, giving the med's 12+ hours apart decreases likelihood of any problems.