Sublingual immunotherapy (also known as SLIT treatment or allergy drops) is a method of treating allergies by placing customized medicated drops underneath the tongue. Over time, a designated amount of physician-dosed antigens is given to build the body’s tolerance to certain allergens. The medicated drops are administered at home, without the use of injections.
Medications such as antihistamines and nasal sprays treat allergy-related symptoms, whereas immunotherapy induces a natural immunity or tolerance to the allergen. The purpose of immunotherapy is to decrease sensitivity to allergy-causing substances so that exposure to the offending allergen results in fewer and less severe symptoms. It is not a substitute for avoidance of known allergens or for the use of allergy medications — it is a supplement to these treatment measures.