• Jext


Medication features

  • Adrenaline auto-injector
  • Used to treat anaphylaxis
  • EpiPens also available


Order Jext Pen UK Online

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 doctors to review. If it’s suitable to prescribe for you, a prescription is sent to our online pharmacy team. From here, your medicine is dispatched to your chosen delivery address. 

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 Simple Online Pharmacy, 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. 

Jext alternatives

Adrenaline auto-injectors are critical medicines that can stop allergic reactions from becoming life-threatening. The other available brands of adrenaline auto-injectors are called EpiPen and Emerade. They are prescription-only medicines that can be prescribed by your GP if you are at risk of anaphylaxis. 

Each brand of adrenaline auto-injector is used slightly differently, although all of them are designed to be easily injected. Visit the NHS anaphylaxis page for information on how to use each brand, or see the instructions printed on the side of the auto-injector that you have.

Jext summary

Active ingredient


Injection site

Outer thigh


From £47.95


300 micrograms


What is the difference between Jext and EpiPen?

Jext and EpiPen are different brands of adrenaline auto-injectors. They are both used to treat an allergic emergency and deliver adrenaline via an injection. However, they are manufactured by different companies and their instructions differ slightly. 

What is Jext injection?

Jext is an adrenaline auto-injector that is used for allergic emergencies. It’s designed to be easy to inject for a person suffering from anaphylaxis, or by someone helping them.

How many types of Jext are there?

It’s available in two strengths, Jext 300mcg and Jext 150mcg.

Can you buy Jext pens over the counter?

Jext, in the UK, is a prescription-only medicine and not available to buy over the counter. However, you can request to buy Jext pens online in the UK from registered online pharmacies, like Simple Online Pharmacy. Simply complete an online assessment form for our doctors to assess to make sure it’s safe to prescribe. Our Jext 300 micrograms price is £47.95 for one device and £94.99 for two devices.

Side Effects

Jext side effects

Side effects of adrenaline can include heart problems like a rapid heartbeat and chest pain, sweating, nausea, vomiting, anxiety and tremors. See section 4 of the patient information leaflet for further detail.


Info Leaflet

Info leaflet

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


How to use Jext auto-injector

The Jext website has a useful guide and video on how to use your injector. You should make sure you know how to use the injector when it’s first prescribed for you. Jext instructions are also included on the side of each injector. You can also see the patient information leaflet for instructions on using the injector.

Order within for guaranteed next day delivery options

ClosePrice Checker
Compare Prices
The variation selected is currently out of stock.
Item added to bag. Click here to view bag.
Please select a size from above to proceed.
There are NHS prescriptions in your basket. Please complete the order first or remove NHS prescriptions from the basket.


Medication Simple Online Pharmacy
300mcg xEpipen 300mcg Adult x 1 £76.95
300mcg xEpipen 300mcg Adult x 2 £93.95


Medication Simple Online Pharmacy
300mcg xJext 300mcg Adult Pen x 1 £59.99
300mcg xJext 300mcg Adult Pen x 2 £119.99
150mcg xJext 150mcg Adult Pen x 1 £59.99
150mcg xJext 150mcg Adult Pen x 2 £119.99
Copyright © 2013 - 2024 Simple Online Pharmacy Ltd. All rights reserved.
Data security and protection policies available by request.
  • Digital Clinical
  • LegitScript approved
  • Registed Pharmacy
  • NHS pharmacy
  • Visa
  • mastercard