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A member asked:
What antihistamines give me 24hr protection? allegra 180mg? can i take xyzal (levocetirizine) 5mg at night and allegra 180mg morning? topping up prove effective?
A doctor has provided 1 answer
Yes: Depends on the condition. Most of the newer antihistamine may cover hay fever symptoms for nearly 24 hrs but would not be sufficient to control hives. Antihistamines have a high safety margin on dosing and thus it is ok for you to use both if necessary.
Answered 9/11/2016
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