Allergen immunotherapy is a medical treatment designed to reduce sensitivity to specific allergens, such as pollen, dust mites, or pet dander. It involves gradually exposing the patient to increasing amounts of the allergen, helping the immune system build tolerance over time. This process can lead to long-term relief from allergy symptoms even after treatment has ended. The treatment typically comes in two forms: subcutaneous injections, known as allergy shots, and sublingual tablets or drops. Both methods aim to modify the immune response, making it less reactive to allergens. Allergen immunotherapy is often recommended for individuals with moderate to severe allergies that do not respond well to standard medications.