Adrenaline Auto-Injector

An adrenaline auto-injector is a prefilled device that delivers adrenaline quickly for suspected anaphylaxis.

Adrenaline helps counter dangerous features of a severe allergic reaction, including swelling that can narrow the airway, wheeze, low blood pressure, faintness, and widespread symptoms after exposure to an allergen. It is intended for urgent use outside a hospital while emergency care is arranged.

The medicine and needle are contained within a single-use injector. Individual devices differ, so the instructions supplied with the prescribed brand matter. A trainer device, when available, lets patients and carers practise the movement without medicine or a needle.

A clinician may prescribe an auto-injector for someone at risk of anaphylaxis, such as after a previous serious allergic reaction. It may be needed after food, medicine, insect venom, or another confirmed or suspected trigger. Use is based on the person’s emergency plan and symptoms, rather than waiting to see whether they settle.

After using an injector for suspected anaphylaxis, call emergency services immediately. Keep the person lying down with their legs raised when possible; if breathing is difficult, they may sit with legs outstretched. Do not allow them to stand or walk suddenly.

Antihistamines can help certain milder allergy symptoms but do not replace adrenaline for suspected anaphylaxis. Inhalers also do not replace an injector when anaphylaxis is suspected. Avoiding known triggers, carrying the device, and sharing an emergency plan with family, school, or colleagues are complementary measures.

Carry the injector where it can be reached quickly, rather than leaving it in a car, checked bag, or another room. Tell regular carers where it is stored and show them the brand-specific instructions. Bring the used device to hospital if advised, so the treating team can confirm what was given.

Keep the device in its protective case and follow the manufacturer’s storage advice. Heat, direct sunlight, and physical damage can affect a device. Check its expiry date routinely and arrange a replacement before it expires. If you are unsure whether a device has been activated, damaged, or stored incorrectly, seek advice from a pharmacist or prescribing clinician.