Zyrtec belongs to the group of medicines known as antihistamines. It can be used to prevent and treat allergic conditions such as hay fever and some allergic skin reactions.

Exposure to pollen, pet fur, house dust or an insect bite can cause the body to produce histamine. The release of histamine causes allergic symptoms which can include rashes, sneezing, watery eyes and a running or blocked nose. Antihistamines stop the effects of histamine and help to relieve these symptoms.

Zyrtec is available in tablet and oral liquid form. It is also sometimes known by several brand names including: Allertek; Benadryl One a Day, Piriteze Allergy; Zirtek Allergy; Zirtek Allergy Relief. These names may appear on the packaging of your medicine.