Jext 0.3mg Pen


Images for illustrative purposes only

  • Jext_300mcg

Jext 0.3mg Pen

  • Medication features

    • Adrenaline auto-injector
    • Used to treat anaphylaxis


NOTE: After selecting this product, you will need to complete a short assessment, so we can make sure this medication is suitable for you. Pricing is provided as a reference only. The final decision on issuing this medication remains with our Prescriber / Pharmacist.

You can request to order Jext adrenaline auto-injectors from our UK registered online pharmacy and doctor service. As part of your order, simply complete an online assessment for our prescribers to review.

This service is only available to patients who have been prescribed this medicine by their GP previously.

What is Jext?
Jext is a brand of adrenaline (epinephrine) auto-injectors. It’s a device that contains adrenaline that’s designed to be easy to inject in emergencies. It’s used for the emergency treatment of severe allergic reactions (anaphylaxis). 

It should be used as soon as you suspect a serious allergic reaction. It can be self-administered or administered by someone else who is helping you. Anaphylaxis is a medical emergency and you should always call 999 for help, even if you have used an adrenaline auto-injector to treat it.

How does it work?
Anaphylaxis, or anaphylactic shock, is a severe and potentially life-threatening reaction to a trigger like an allergy. It happens when the immune system of the body overreacts to a trigger. This overreaction can cause various symptoms such as swelling of the throat, lips and tongue, rash, shortness of breath, vomiting, and nausea. It can also lead to serious problems with the cardiovascular system and blood flow

Jext pens work by delivering adrenaline into the body with an injection. This works on the respiratory system and the cardiovascular system to stop the serious effects of anaphylaxis. It causes blood vessels to constrict, stimulates heartbeat, relaxes muscles in the lungs to improve breathing and reduces swelling.

Jext dosage
The recommended dose for adults and children who weigh over 30kg is Jext 300mcg injected into the outer thigh for allergic emergencies. It’s recommended that children who weigh between 15kg and 30kg use Jext 150mcg for allergic emergencies. At, we only offer the 300mcg strength for use in adults over 18 years old.

If you’re not sure about the correct dose for you, speak to your GP for advice. Sometimes a single dose of adrenaline may not be sufficient to completely reverse the effects of a serious allergic reaction. This is why you should always carry 2 adrenaline pens. If symptoms have not improved within 5 - 15 minutes of the first injection, you should use a second injection. 

Side Effects

Side effects of adrenaline can include heart problems like a rapid heartbeat and chest pain, sweating, nausea, vomiting, anxiety and tremors.


Info Leaflet

Before taking any medication, it is important to read the Patient Information Leaflet. 

Jext Patient Information Leaflet