Allergy medicine refers to medications that are used to treat allergies or allergen-induced symptoms. Allergies occur when the immune system overreacts to a substance, such as pollen, pet dander, or certain foods, and produces an inflammatory response in the body. This can result in symptoms like sneezing, itching, runny nose, and congestion. Allergy medications work by reducing the immune system's reaction to allergens, thereby alleviating these symptoms. There are several types of allergy medicine available, including antihistamines, decongestants, corticosteroids, and leukotriene modifiers. These medications can be taken in various forms such as pills, liquids, nasal sprays or eye drops, depending on the type of allergy being treated.