Medical 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 If you're still miserable, there are always immunotherapeutic allergy shots for building up allergen antibodies. They're particularly effective for allergies to stinging insects, dust, pollen and pets.—Nancy Shute, American Health, July 1987 The most common side effects of allergy shots are redness and swelling at the site of injection.—Richard F. Lockey, The Tampa (Florida) Tribune, 29 Mar. 2008
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