Sometimes, antihistamines can actually worsen a dry throat. Since these medications aren't providing relief, it is very important to have him evaluated by a doctor. A persistent dry cough at his age can stem from various sources, such as acid reflux, environmental irritants, or even a side effect of certain common blood pressure medications. In the meantime, please ensure he stays well-hydrated with warm fluids and uses a room humidifier. A professional evaluation will help identify the exact cause and provide the right targeted treatment.
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What can my dad do for a persistent dry cough and dry throat that are not improving despite gargling regularly and taking Ascoril and Allerga?