Reactine Extra Strength Allergy Relief Tablets relieves indoor and outdoor allergy symptoms with this allergy medicine. Indoor allergens, including mold, dust, and pet dander can cause allergy symptoms at home and at work. Since indoor allergies can be triggeredany time of year, they can often be easily confused with a cold. Understanding and recognizing the symptoms is half the battle. Allergy symptoms kick in when your immune system overreacts to substances called allergens. Your body releases many chemicals, one of which is called histamine. Histamine is the most abundantly released chemical and is responsible for causing most of your symptoms. Antihistamines are your first line of defense for allergy symptom relief. Antihistamines treat itchy and watery eyes, runny nose and sneezing, itchy nose and throat, and allergic skin itch (like hives) caused by seasonal and perennial allergies. Antihistamines work by blocking the sites where histamine binds. Reactine contains the 10-milligrams of Antihistamine Cetirizine Hydrochloride which provides fast, 24-hour symptom relief. Speak to your doctor or pharmacist. To be sure this product is right for you, always read and follow the label.