Reactine Regular Strength Allergy Tablets provides relieves from itchy, watery eyes, runny nose and sneezing, nasal congestion/stuffiness, itchy nose and throat, allergic skin itch like hives. Reactine contains 5 milligrams of Antihistamine Cetirizine Hydrochloride. Antihistamines are your first line of defense for allergy symptom relief. Antihistamines work by blocking the sites where histamine binds. Histamine is the most abundantly released chemical and is responsible for causing most of your symptoms. Reactine provides 24-hour relief from your outdoor and indoor allergy symptoms. Understanding and recognizing the symptoms is half the battle. Allergy symptoms kick in when your immune system overreacts to substances called allergens. Indoor allergens, including mold, dust, and pet dander can cause allergy symptoms at home and at work. Since indoor allergies can be triggered any time of year, they can often be easily confused with a cold. Outdoor pollen from the spring, summer, and fall can be present inside your home too. Includes 36 tablets per pack. Speak to your doctor or pharmacist. To be sure this product is right for you, always read and follow the label.