Moving: Claritin

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How Long for Claritin to Take Effect?

Hi - We gave our son a 24 hour dose of Children's Claritin for allergies. We haven't seen any change. How long does it take to have effect? I know that Benadryl is fast acting. How long before I can give him a different allergy med if it doesn't help? I'll talk to his dr in the morning, but wanted to hear personal experiences. Thank you!