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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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Email Us

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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Allergy Forecast
ALLERGY FORECAST

Get Pollen And Weather Info On The Go!

Check out our AllergyCast apps and tools that can help you track your allergy symptoms, so you can manage your day!

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