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A member asked:
Antihistamines seems to wear off at ~8 hours, followed by allergies later. how much antihistamine should i take everyday? is too much a day harmful?
A doctor has provided 1 answer
4x/day: With non-sedating antihistamine, you can take it up to 4x daily. However if your symptoms are that severe, you need to consult an allergist since antihistamine alone rarely provides enough relief since it does nothing on the nasal congestion.
Answered 7/23/2014
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