Anaphylaxis is a serious, potentially fatal allergic reaction and medical emergency that is rapid in onset and requires immediate medical attention regardless of use of emergency medication on site.
A rare but life-threatening whole-body allergic reaction. Symptoms may appear quickly and include difficulty breathing, swelling of the throat or other parts of the body, rapid drop in blood pressure, dizzi ness, or unconsciousness. Anaphylaxis can be triggered by foods, drugs, insect stings, or exertion.
Extreme sensitivity to a substance such as a foreign protein or drug.