EpiPen is a pre-filled auto-injector containing adrenaline (epinephrine) used for the emergency treatment of severe allergic reactions (anaphylaxis). It works by rapidly narrowing blood vessels, relaxing airway muscles, and reducing swelling, helping to reverse life-threatening symptoms such as difficulty breathing, low blood pressure, and widespread hives.

The EpiPen is designed for quick, easy use – it is injected into the outer thigh, even through clothing if necessary. It provides temporary relief until emergency medical help is available. People at risk of anaphylaxis, such as those with severe food, insect sting, or medication allergies, are advised to carry an EpiPen at all times.