About Kirkland Signature Aller-Tec The active ingredient in Aller-Tec® is Cetirizine Hydrochloride, 10 mg, an antihistamine approved for the treatment of both indoor and outdoor allergy symptoms. One dose of Aller-Tec® works for a full 24 hours. Aller-Tec® is approved to temporarily relieve indoor and outdoor allergy symptoms in adults and children 6 years and over. Compare to Zyrtec® active ingredient All-Day allergy relief Original prescription strength For indoor and outdoor allergies 24-hour relief of: sneezing; runny nose; itchy, watery eyes; itchy throat or nose Understanding Allergies An allergy is a sensitivity to a substance that is normally harmless. Flowers, trees, a family pet, or dust are examples of things that can cause an allergy. Even foods like peanut butter, fish, and milk can cause an allergic reaction to people with sensitivities to them. A substance that triggers an allergy is called an allergen. People can have different reactions to allergens, even when they are allergic to the same things. In rare cases, allergens can cause a severe reaction called anaphylaxis that can result in shock and can even be life-threatening. Allergens most likely to cause this dangerous response include some foods (such as peanuts and shellfish), drugs, insect stings, and latex. The reaction may begin almost immediately after contact with the substance. Some common reactions a person might experience after contact with an allergen include: asthma hay fever upset stomach eczema (a skin disease) itching itching of the roof of the mouth itchy ears, nose and throat
