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

Your Jext®

Jext® comes in two different doses


150 micrograms for patients weighing between 15 – 30 kg


300 micrograms for patients weighing greater than 30kg

When to use

How to use Jext®

Step 1

Grasp the Jext® in your dominant hand (the one 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 firmly 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 outer 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.

Next steps to take

Seek medical attention

Call 999 in the UK, or 112 for Ireland, ask for an ambulance and say “anaphylaxis”. If you are unable to make the call, get someone else to call for you.

Be prepared

Use a second Jext® after 5-15 minutes if the symptoms do not improve. Always carry an extra Jext® with you.

Learn more about Jext®

Learn more about Jext® with our 360° interactive pens

Find out more

How to use video

Check out our demonstration video to familiarise yourself, family and friends with what to do in the event of an anaphylactic reaction, how to recognise the symptoms and how to administer Jext®.

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