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A member asked:
I have allergy testing mon morn, i took a zyrtec dissolve tablet 5pm fri due to an allergic reaction. from your chart, it should be out of my system?
A doctor has provided 1 answer
72 hrs: Although some allergists consider Zyrtec to have a 7-day effect, a few studies have shown that a 72-hour wait is sufficient for skin testing purpose. Since you took the drug just a few hours shy of the 72 hrs, it is likely ok especially if you had a good histamine response in the skin test.
Answered 7/31/2017
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