anaphylactic shock - A rare, life-threatening allergic reaction that occurs in people with an extreme sensitivity to a particular substance (allergen), often insect venom, a food item, or a drug (see allergy).
When the allergen enters the bloodstream, massive amounts of histamine and other chemicals are released, causing sudden, severe lowering of blood pressure and constriction of the airways.
Other symptoms may include abdominal pain, diarrhoea, swelling of the tongue and throat, and itchy rash. Anaphylactic shock requires emergency medical treatment. An injection of adrenaline may be life-saving. Antihistamine drugs and corticosteroid drugs may also be given.
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