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What can I give my 5-year-old son for seasonal allergies?

For seasonal allergies in a 5-year-old child, you can give them an antihistamine by mouth. A good option is to look for a children's formulation like Claritin™, with the dosage instructions based on their weight. If there is no improvement within the first 48 hours, don't get discouraged, as it may take up to 7 days to see a significant difference.