Usually, the sooner the reaction starts, the more severe it will be. Anaphylactic Reactions Anaphylactic reactions require the special needs driver team to call 911 immediately. Anaphylactic reactions are general, dramatic reactions that can result in collapse and possibly death. It is caused by a sudden release of histamines and other chemicals that overwhelm the body. The onset is usually quite rapid and symptoms occur within minutes.
Death can potentially occur immediately or within two hours.
The first sign may be swelling and redness of the skin or may be a non-visible internal reaction such as swelling of the airway, a drop in blood pressure, shock, or nausea. The allergic person may also have a feeling of great anxiety. Immediate action is needed. For this type of reaction, call for medical help immediately. Minutes are vital.