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Illustration of an orange cat on a green background
Indoor Allergies

Allergies To Cats: Symptoms, Treatment and Causes

Although our feline friends are so fondly regarded that they’re found in an amazing one third of all households, cats are also the leading driver of pet allergies in the US.
AllergyCast app
Allergy Forecast

Discover Your Allergy Forecast with ZYRTEC®

Get allergy forecasts & see pollen counts near you today with our online allergy index tool or try the ALLERGYCAST® app for a personalized allergy forecast & tracker.
Cetirizine hydrochloride chemical structure
Allergy Treatment

What Is Cetirizine Hydrochloride (HCl), And What Is It Used For?

Cetirizine is an antihistamine often used to treat allergy symptoms. In this guide, we explore how it works, its side-effects and correct dosage.
Illustration of a person with a mask on, surrounded by plants, fruits, and vegetables
Outdoor Allergies

Understanding Summer Allergies: Causes, Symptoms & Management Tips

Don’t let allergies ruin your summertime fun. Learn all about June, July, August & September allergies, plus discover common causes & symptoms of summer allergies & more
eye allergies
Outdoor Allergies

Allergies & the Weather

See how the changing weather can affect your seasonal allergies and learn about ways to help keep allergies in check during seasonal shifts.
Allergy Treatment

Allergy Muddlers in America

Read facts about how allergy symptoms are on the rise and learn how you can find relief from your worst allergy symptoms with ZYRTEC®.
Infographic titled "6 things to Know About Sinuses"
Allergy Symptoms

6 Things to Know About Sinuses

You know sinuses are in your head, but have you ever wondered exactly what they are? Here are some things to know about sinuses.
Antihistamines and How Do They work
Allergy Treatment

What are Antihistamines and How Do They Work?

Learn all about antihistamines, including what they are, how they work, what they treat & more. Plus, find answers to frequently asked questions about antihistamines.

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