Zyrtec (cetirizine): The effect of Flonase takes time to develop. The effect of anti-histamines like Zyrtec (cetirizine) are "immediate" and anti-histamines differ in effectiveness from person to person. Hope this helps Dr Z
Answered 10/31/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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