Adrenaline (epinephrine) is a natural hormone released in times of stress, during exercise, and in response to low blood sugar. It conditions the body to be prepared for strenuous activity or life-threatening situations. When severe allergic reactions are triggered by a drug allergy, food allergy, or insect allergy, a quick injection of adrenaline with an EpiPen is the life-saving antidote. Adrenaline needs to be injected because if taken orally, it will easily be destroyed by the enzymes in the stomach. Once the adrenaline enters the body system, it will immediately reverse the effects of anaphylaxis by opening up the airways, reducing throat swelling, and maintaining blood pressure at a steady level.