A member asked:

Will flonase or zyrtec (cetirizine) provide more allergy relief within the first two weeks?

A doctor has provided 1 answer
Dr. Richard Zimon answered

Specializes in Internal Medicine

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

3.6k views

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