This website has been developed and funded by ALK and is intended for children who have been prescribed Jext ®, their parents and carers.

How to use your Jext®

Jext® comes in two different doses

150 micrograms if you weigh
between 15-30kg


300 micrograms if you weigh
over 30kg

When to use Jext®

How to use Jext®

Step 1

Hold the Jext® in the hand that you use to write with, with your thumb closest to the yellow cap.

Step 2

Pull off the yellow cap with your other hand.

Step 3

Place the black injector tip against your outer thigh, holding the injector at a right angle (approx. 90°) to the thigh.

Step 4

Push the black tip as hard as you can into your outer thigh until you hear a ‘click’ confirming the injection has started, then keep it pushed in. Hold the injector firmly in place against the thigh for 10 seconds (a slow count to 10) then remove. The black tip will extend automatically and hide the needle.

Step 5

Massage the injection area for 10 seconds. Seek immediate medical help.

Extra steps to take

Seek medical attention

Once the Jext® has been administered call 999 in the UK or 112 in Ireland, and ask for an ambulance and say “anaphylaxis”. If you are alone when you have a reaction, you will have to make the call yourself. Don’t worry, the person who answers the phone will know exactly what to do.

Be prepared

Use a second Jext® after 5-15 minutes if you still feel poorly. This is why you should always carry two Jext® pens.

Stay where you are

You should remain still and laid down until the ambulance arrives. Don’t try to get up, even if you start to feel better.

How to use

Check out our demonstration video to learn what to do in the event of an anaphylactic reaction, how to recognise the symptoms and how to use Jext®.

*Educational Risk Minimisation Materials to help reduce the risk associated with using this medicine.

Practice makes

A Jext® Trainer is just like the ‘real’ Jext® except for three things – it doesn’t contain any medicine (adrenaline), it has no needle and it can be used repeatedly. It works in exactly the same way as a real Jext® and you can use it to practice.