Relating to anaphylaxis, the extreme, whole-body allergic reaction in which the immune system overreacts catastrophically to a food, drug, insect sting, or other trigger. An anaphylactic response releases a flood of histamine and other mediators that dilate blood vessels, swell airways, and drop blood pressure within minutes, and it can kill without prompt treatment. People at risk describe their triggers as anaphylactic allergens and carry adrenaline auto-injectors as the essential rescue. In food labeling and manufacturing, understanding which proteins provoke anaphylactic reactions drives allergen controls, dedicated production lines, and precautionary labeling. The adjective marks the boundary between an uncomfortable allergy and a medical emergency, and food businesses that grasp the distinction design their allergen management accordingly.