or anaphylaxis Anaphylaxis an extreme form of allergic reaction (anaphylaxis) anaphylactic A severe allergic reaction is called anaphylaxis. Anaphylaxis See separate leaflet called Anaphylaxis for more details This severe reaction is called anaphylaxis anaphylaxis an extreme form of allergic reaction (anaphylaxis) Anaphylaxis an extreme form of allergic reaction (anaphylaxis)