It may or may not even help. ETD happens when the Eustachian tube swells with allergic stimulation or a URI. When the tube is blocked by the swelling. mucus made in the middle ear cannot flow to the throat & air cannot enter the middle ear to keep it normal. Antihistamines may thicken mucus & even slow improvement. ETD stops when the irritation resolves. Your body fixes it/not meds.
Answered 5/18/2022
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