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If antibiotics did not help, but Zyrtec did, this probably is related to allergies. It could be to pollen, dust, mold, any airborne allergen. You could have allergy testing done to be sure that is the problem.
You could continue the Zyrtec or try a different antihistamine. You could try nose drops made for children such as Little Noses, 1 drop in each nostril once or twice daily. For his runny eyes you could try Terramycin eye ointment which is available without prescription except in California.
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