Cetirizine is a compound with an anti-histamine effect that is generally used to treat allergic symptoms due to hayfever and other airborne allergies such as house dust mite and pet allergies.
Allergens like pollen, pet fur, house dust or insect bites may lead to an excess of a chemical called histamine in the body. A treatment of cetirizine works by helping to stop this from happening as long it is taken before you come into contact with the substance you're allergic to.
Cetirizine is a shortened form of the proper chemical names, Cetirizine Hydrochloride and Cetirizine Dihydrochloride and as the names may suggest, they're very similar with very few differences in their efficacy or effects. It has become a popular treatment for hayfever as it is one of the newer, non-drowsy antihistamines that are less likely to make you feel sleepy.
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