You are correct, one would have expected an antihistamine to help to clear your son's nose if he has allergic rhinitis. Sometimes the allergy is so severe that an antihistamine alone is not ebnough to clear up the swelling of the mucous membrane lining of the nose. In any case your son needs to be tested for allergies and to have his nose properly treated. He should be seen by a paediatrician with an interest in paediatric allergy,known as a paediatric alllergist. There are experts in all the main centres in SA.
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