A member asked:

I took zyrtec last night to help w/itch &redness of poison ivy, but haven't seen much difference. should i have by now or does it usually take longer?

A doctor has provided 1 answer
Dr. Luis Matos answered

Specializes in Pediatric Allergy and Asthma

Itch better in 1 hr : Cetirizine ( Zyrtec) is an antihistamine that will help with the itch but not the redness or blisters. You will need to get Hydrocortisone cream to help with that and it will take many days for it to heal.

Answered 7/9/2017

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