Immunotherapy involves a series of shots given to desensitize your body to an allergen. It requires regular treatments lasting up to three to four years. Because of the time and expense involved, you need a realistic idea of the benefits before agreeing to the treatment. Immunotherapy is 98 percent effective from allergies to bee stings and other insect venoms. For most people, it is effective against grass, tree, and weed pollens, as well as house dust, the house dust mite, dog and cat dander.
Treatment is effective only if the specific allergen has been identified by sensitivity testing.
You have tried home treatment without success. You have tried both prescription and non prescription medications without relief. Immunotherapy is effective for allergens identified by skin tests.