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A member asked:
How long until an antihistamine works on post nasal drip?
A doctor has provided 1 answer
THEY WON'T HELP MUCH: Other than drying it up a bit and thickening it, which can cause cough. The key in trying to eliminate postnasal drip is to cut the inflammatory or environmental response that it is caused by.
Answered 9/11/2018
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