Allergen immunotherapy is a treatment plan to help those who suffer from allergies. Some individuals find that their quality of life is greatly affected by pollen, dander, and other foreign substances. Antihistamines significantly reduce the body's reaction during exposure, but they need to be taken regularly and prior to. That’s a lot of preplanning. With allergy shots, you and your ENT can work out a treatment plan that helps your immune system build up a resistance.