How Does ZYRTEC Work?

When you are exposed to something you are allergic to, your body makes something called histamine. Histamine causes you to have allergy symptoms. Things like sneezing and itchy eyes.

ZYRTECÂ® (cetirizine HCl) is an antihistamine, which helps block the action of histamine to help relieve you of your indoor and outdoor allergy symptoms.

What symptoms does ZYRTEC relieve?

Most people who suffer from allergies have many symptoms.

ZYRTEC helps relieve:

itchy, red, watery eyes
sneezing and runny, itchy nose
postnasal drip
itching from hives

ZYRTEC-D 12 HOURÂ® (cetirizine HCl 5 mg/pseudoephedrine HCl 120 mg)
Extended Release Tablets help relieve:

itchy, red, watery eyes
sneezing and runny, itchy nose
postnasal drip
nasal congestion (stuffy nose)

How soon will I get relief?

In clinical studies, people taking ZYRTEC were relieved of their symptoms within 1 hour. Studies show that symptom relief from a single dose of ZYRTEC lasts 24 hours.