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Frequently Asked Questions

ZYRTEC® relieves your worst allergy symptoms of sneezing, runny nose, itchy, watery eyes, and itchy nose or throat.

An antihistamine is a drug that blocks the action of histamine—an allergy-causing chemical that’s released by certain cells in the body. Antihistamines are used to treat runny nose, sneezing and other allergy symptoms.

ZYRTEC® begins to work at hour 1 on the first day you take it.

Don’t see your questions? See FAQ page.

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For all other comments, questions, and feedback about our products, please email us. Please note: our response time to emails is typically between 48-72 hours.

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For an immediate response or to report an adverse event or a side effect from our products, please call us at

Monday – Friday 9:00am – 5:30pm ET

1-800-343-7805

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Where to Buy

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An illustration of the ZYRTEC® ALLERGYCAST® app icon, featuring a smartphone with a pollen level gauge
ALLERGY FORECAST

Get Pollen And Weather Info On The Go!

Check out our ZYRTEC® ALLERGYCAST® app & tools that can help you track your allergy symptoms, so you can manage your day!

LEARN MORE

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