An adrenaline auto-injector (brands include EpiPen, Jext, and Emerade) is the first-line treatment for anaphylaxis. The general steps are: hold the device in your fist without touching either end, remove the safety cap, place the injecting tip against the middle of the outer thigh, and push firmly until it activates, holding it in place for the time stated in that device's instructions (often a few seconds). It works through clothing, so you do not need to expose the skin.
After giving the injection, call your local emergency number straight away and say the word anaphylaxis. Keep the person lying down with legs raised if possible. If there is no improvement after about five minutes and a second device is available, a further dose can be given. Note used devices and bring them to hospital.
Devices differ slightly between brands and update over time, so always follow the printed instructions on the specific injector and the action plan from your doctor or allergy nurse. Check expiry dates regularly, store the device as directed, and practise with a trainer pen. A pharmacist or doctor can walk you through your particular device.