Allergy shots are a specific and successful treatment method. SLIT skin tests and sometimes blood tests are used to make up vials of allergy-inducing substances specific to an individual patients profile. The physician determines the best concentration for the first treatment. Once injected, these treatments form blocking antibodies in the patients blood stream that interfere with the allergic reaction. Injections are typically given for a period of three to five years. Patients with allergies are more likely to need treatment for sinus infections.