Adrenaline (epinephrine) is a natural hormone released in response to stress. When injected, adrenaline rapidly reverses the effects of anaphylaxis by reducing throat swelling, opening the airways, and maintaining heart function and blood pressure. Anaphylaxis is a potentially life threatening, severe allergic reaction and should always be treated as a medical emergency. Adrenaline injected into the outer mid-thigh muscle is the first line treatment for anaphylaxis.
Read about Adrenaline for severe allergies on the Australasian Society of Clinical Immunology and Allergy website.