Definition of allergy shot
: an injection containing very small amounts of an allergen (such as mold or grass pollen) to which an individual is sensitive that is given at regular intervals usually over a period of several years to desensitize the immune system and reduce allergic symptoms
- The goal of allergy shots is to render a person tolerant to an allergen when it is encountered.
- —Jane E. Brody
- The most common side effects of allergy shots are redness and swelling at the site of injection.
- —Richard F. Lockey
