Immunotherapy can prevent the development of new allergies, and in children it can prevent the progression of allergic disease from allergic rhinitis to asthma. The effectiveness of allergy shots appears to be related to the length of the treatment program as well as the dose of the allergen. Allergy shots help your body get used to allergens, the things that trigger an allergic reaction. https://insidexpress.com/lifestyle/health/immunotherapy-a-safe-effe...