Allergy shots, or immunotherapy, are given regularly to gradually increase tolerance to allergens and reduce allergy symptoms. The treatment involves injecting gradually increasing doses of the allergen, which helps the immune system become less sensitive to the substance. The shots are initially given once or twice a week and then administered every 2 to 4 weeks for 2 to 5 years. Allergy symptoms may become milder or even disappear completely during this time. It is important to avoid exercise or vigorous activity for two hours before and after the appointment, and to inform the company about any medications being taken or if the patient is pregnant or planning to become pregnant.