Medication features:

  • Adrenaline auto-injector (AAI)
  • Emergency treatment for severe allergic reaction “anaphylaxis”
  • Alternative to EpiPen


Available strengths:

300 mcg 150 mcg


Price £49.99

Includes free private prescriptions

In stock

Delivery Time


Expected delivery date:

Wednesday, 13 December 2023

If you order within:


Next Day Delivery

Next Day

Quick Assessment


UK Registered Pharmacy

UK Registered

Discreet & Confidential

Discreet &

  • Overview
  • FAQ
  • Side Effects
  • Patient Information Leaflet
  • Reviews

What is Jext

Jext is a commonly used adrenaline pen for conditions like severe allergic reactions, cardiac arrest, etc. Such injectors are often called Adrenaline Auto Injectors. They contain the hormone adrenaline as a tartrate. It belongs to a class of medications known as "sympathomimetics" for emergency treatment during severe allergic reactions. The primary function of a single dose of adrenaline, stimulates heartbeat and speed up your pulse. The adrenaline auto injector combats cardiac arrest and treats severe allergic reactions.

severe allergic reactions can occur as a side effect of exposure to allergens. Anyone near a substance they are allergic to for a considerable time can go into anaphylactic shock. During allergic emergencies, your airways close in, and your tongue tends to swell. As a result, you face difficulty breathing, and you experience nausea, vomiting or dizziness. Falling unconscious is also a symptom of anaphylaxis. In addition, your blood pressure drops, and blood supply to the heart slows down.

During cardiac arrest, you experience similar symptoms. The blood flow to the heart is extremely low, your blood vessels get dilated, and as a result, many organs are deprived of a steady blood flow. This is an emergency situation that can be fatal. That is why using the adrenaline pen immediately is essential.

Why choose Jext?

Anaphylactic shock is a serious life threatening shock. It is described as life-threatening because it can lead to death if proper medical assistance doesn't arrive in time. In such a situation, waiting for an ambulance or driving to the hospital can cause a delay in the treatment required. That is why having a Jext auto injector to hand is very crucial. The Jext pens are easy to use, and anyone can administer them for you.

Can I buy Jext online?

Yes, you can buy Jext online in UK. You can buy Jext pens as a pack of 1 or 2 pens. Keep in mind that Jext 300mcg is a strong deterrent. This means you will need a prescription to purchase it. You can also buy Jext adrenaline auto injectors from Click Pharmacy after completing a short medical assessment. Once the assessment is complete, our prescribers will issue a prescription to buy a Jext auto injector on our website. Your purchase is sent in discreet packaging through Royal Mail 1st class or next-day delivery service.

Difference between EpiPen and Jext

Although both Adrenaline auto injectors (epinephrine) come in the same doses and their purpose are identical, their mechanism is slightly different. The EpiPen has a spring-loaded concealed needle that delivers a single measured dose when the pen is jabbed against the outer thigh muscle. EpiPen's patent 'click' mechanism indicates when the injection has started. Jext auto injector, on the other hand, is a single-use auto injector which has a locking needle shield designed to protect against accidental needle stick injury, activated once the injection has been administered. 

What dose of Jext should I choose?

The Jext Pen dose varies according to age and body build. The usual dose for individuals who weigh 15kgs to 30kgs is 150mcg. For those weighing above 30 kg, a dose of 300mcg is sufficient. However, your doctor may need to adjust the dosage according to the severity of your allergies. Therefore, you should always consult a doctor before purchasing the Jext pens. In case of a severe allergic reaction, there can be a need to administer 2 Jext adrenaline auto injectors. So, keeping 2 Jext pens for allergic emergencies is always advised.

How should I take the Jext pen?

If you are someone who requires a Jext 300mcg, you should ask the doctor or medical professional to explain how to use it in severe allergic reactions as an emergency treatment. In addition, make sure people who spend a lot of time with you, family members, close friends, and Co-workers are also aware that you require a Jext 300mcg and know how to administer one in case you cannot inject it yourself.

The Jext adrenaline auto injectors should only be administered on the outer thigh muscle and used as soon as you come in contact with the allergen to treat anaphylaxis. First, remove the substance that induced your allergic reaction from the body and clean the surface. Then, remove the yellow cap and place the black tip of the Jext adrenaline auto with your dominant hand at a 90 degrees angle at your outer thigh muscle. Then press the black tip, releasing the adrenaline into your body. You have to keep this position maintained for about 10-15 seconds. After removing the Jext auto injector, massage the injection area for 10 seconds.

Sometimes, in a potentially life threatening reaction, a single dose of adrenaline is not enough and you may require 2 Jext adrenaline auto injectors. For example, the first injection might not reverse the side effects if you've been exposed to many allergens or for too long. When this happens, you should wait 10-15 minutes before using the second injection in the same way.

How does the Jext work?

The Jext adrenaline auto injectors work by releasing a hormone known as epinephrine or, more commonly, a dose of adrenaline into the body. Adrenaline is called the fight or flight hormone. During an allergic emergency, it takes measures to control your body's functioning and respond to the outside stimulus accordingly to treat anaphylaxis.

Usually, when exposed to an allergen, your body will undergo stress and you may have difficulty breathing. Your airways will begin to close up, your blood vessels will be dilated, blood flow to the heart will decrease, and you may go into anaphylactic shock or cardiac arrest. The Jext pen will work to reverse this. The adrenaline will stimulate the flow of the blood to the heart to increase. This happens when the adrenaline targets the beta and alpha receptors. The alpha receptors are in the walls of the blood vessels. The adrenaline stimulates them to narrow, and the flow of the blood becomes more steady and increases.

The heart and lungs contain the beta receptors. When they are stimulated, your airways begin to clear up. The choking sensation subsides, and it becomes easier to breathe. During an anaphylactic episode, your organs do not receive the proper flow of blood. But this problem is quickly solved when the alpha and beta receptors are in action. The heart and lungs receive adequate blood. The appearance of a rash or hives also goes down.

Can you use a Jext pen when pregnant?

Research shows no harmful effects of the Jext 300mcg on your unborn baby. The anaphylactic reaction, however, is hazardous for your unborn baby. It can lead to a loss of oxygen to the baby, stunting their growth and may even lead to permanent damage to motor functions. That is why doctors recommend using the Jext pen immediately when experiencing allergic emergencies.

You can also use the medication for emergency treatment if you are breastfeeding.

You must inform the local GP if you are pregnant or currently breastfeeding when they recommend an adrenaline auto injector. If you require a different Jext dosage than the recommended dose, your doctor will adjust it accordingly.

How to store a Jext pen?

You should never forget to be extremely careful with your adrenaline auto injector. Firstly, storing the Jext 300mcg carefully and in the proper condition is essential. If it is in an environment that is too hot or cold for the adrenaline stored inside, it may go bad. Secondly, always make sure to check the expiry date of your Jext. Using an expired Jext is hazardous to your health and can have the opposite of the intended effect.

Always make sure to store your Jext in its original carrier. Make sure the temperature is 25 degrees or below. It would help if you did not refrigerate or freeze the Jext 300mcg. This will cause the adrenaline to go bad as well. The colour of the liquid in the carrier should always be transparent. It should not be foggy. If it appears to be cloudy, it's an indication that the fluid has expired. It would help if you replace the Jext pen immediately in such a circumstance. Finally, keep the Jext stored where children cannot easily reach it. If children get ahold of the Jext and use it without supervision, take them to the doctor immediately.

What are the side effects of Jext?

Like other injectable substances, Jext has numerous side effects as well. These side effects may not impact everyone who use Jext. However, if they affect you, you should contact a physician and discontinue use until they give you the go-ahead.

Some of the common side effects that you can expect to see within 5-10 minutes of injecting the Jext include:

  • Dizziness
  • Light-headedness
  • Difficulty in breathing
  • Headache
  • Nausea
  • Vomiting
  • Weakness
  • High blood pressure
  • Rapid pulse rate
  • Anxiety
  • Hallucinations
  • Tremors

If you accidentally inject the Jext pen without an allergic recreation, you might experience an increase in your pulse rate. In such a case, you should contact a doctor immediately.

Although the Jext pens are safe to administer, you must be cautious with a few conditions. For instance, patients with cardiovascular diseases like atherosclerosis, cardiac arrhythmia, hypertension, and obstructive cardiomyopathy may see a different range of side effects from the Jext. Thus, it would help if you did not use it until your doctor has given you the go-ahead that it is safe for you.

You should also inform your doctor if you are on any other medication. Adrenaline may interact with other medications and cause serious effects. Let your doctor know if you are taking any of the following kinds of medication:

  • Antidepressants
  • Medication against Parkinson's disease
  • Medication for breathing problems
  • Medications for thyroid issues
  • Alpha and beta-blocking medications (since these are the central receptors targeted by the Jext pen)
  • Anti-allergy medications

These are some medications that adrenaline may not exhibit the best reactions. You should let your doctor know beforehand if you are using them. Secondly, avoid alcohol after you use Jext since alcohol exacerbates the impact of adrenaline.

Jext Alternatives

Adrenaline auto injector is an essential medicine that helps stop a severe allergic reaction to treat allergic emergencies. There are various available brands of adrenaline auto injectors; however, the most commonly used ones are EpiPen and Emerade. Note they are prescription only medicines. Therefore, you should ask your GP if you are at risk of potentially life threatening reaction in order to attain a prescription.

While all adrenaline auto injectors contain the same active ingredient, they differ according to how they are used. Therefore, each adrenaline auto injector is used in a slightly different way. However, none of them are complicated to use.

Can you buy Jext over the counter?

No. Jext is a prescription only medicine in the UK. Therefore, you can not buy it over the counter. However, you can get them through a UK registered online pharmacy. You will be required to complete a quick online assessment, which will be reviewed by a professional available on-site. Once assessed and approved, you will be issued a prescription. Then, with the help of the prescription, you will be able to order Jext with ease.

How long does Jext take to work?

In most cases, the adrenaline auto injector starts working immediately. Therefore, you can expect symptoms associated with severe allergies, such as wheezing or difficulty breathing, to improve within minutes if you use jext immediately. However, the Jext dosage effects only last 10 to 20 minutes.

If the symptoms do not subside within 10 minutes, it may indicate that you need a second dose. However, it is crucial to note that other symptoms may take longer to alleviate. For instance, symptoms like rashes, swelling, and abdominal pain may take more than 10 minutes to go away. If they do not, you should seek medical attention right away.

Can children use a Jext pen?

Children can use the Jext pen 150mcg after consultation with their doctor.

What is the difference between the Jext and Jext Kids?

The Jext delivers a dose of 300 mcg, suitable for people weighing above 30 kgs, while the Jext Kids. provides a dose of 150 mcg, ideal for those weighing 15kgs to 30 kgs.

When should I inject a Jext pen?

You should use the Jext as soon as the allergic reaction occurs.

Who should inject a Jext pen?

The person undergoing the allergic reaction can administer the injection themselves, or someone in the vicinity may help.

How long should I hold the Jext in place when injected?

You should keep it in place for a minimum of 10 seconds.

How should I inject the Jext pen?

Press it into the thigh at a 90 degrees angle and hold for 10 seconds before letting go.

What if I use a Jext pen when I don't need to?

You should immediately contact the doctor if you accidentally use a Jext pen at the wrong time. You might witness swelling or damage in specific tissues.

Can I use a Jext pen if I am pregnant?

Yes, you can use a Jext pen when pregnant. There is no research to show that adrenaline is harmful to the baby.

Can I inject a Jext pen through my clothes?

You can inject the Jext pen through clothes. However, it'll be easier to inject directly into the skin.

What should I do if I accidentally open the safety cap of the Jext pen?

If you have activated the Jext pen, you must dispose of it. Otherwise, you can pop the cap back on and leave it be.

Where do I store my Jext Pen?

Never freeze your Jext pen. Instead, keep it in the original carrier below 25 degrees.

How do I dispose of the Jext pen?

You can dispose of the Jext in the proper rubbish bin. Check for a needle cover so that it does not accidentally poke someone.

What should I do if there's an air bubble in my Jext?

Air bubbles are natural and will not cause you any harm. You can use the Jext as it is.

Can I travel with my Jext?

You should never travel without your Jext pen, however you are required to carry a valid prescription when traveling on board a plane or going through custom control at an airport. 

After you have injected the adrenaline auto injector for emergency treatment, you can expect to experience the following side effects:

Common Side Effects

  • Dizziness
  • Heart palpitations
  • Tremors
  • Anxiety
  • High blood pressure
  • Headache
  • Difficulty breathing
  • Paleness
  • Weakness
  • Nervousness
  • Irregular heartbeat
  • hypertension
  • Sweating
  • Apprehension
  • Nausea
  • Vomiting

Serious Side Effects

  • Chest pain
  • Cardiomyopathy
  • Seizures
  • Confusion
  • Vision changes
  • Fainting

If you accidentally inject the adrenaline auto injector without an allergic recreation, you might experience an increase in your pulse rate and rapid heartbeat. In such a case, you should immediately contact a medical professional or healthcare expert to seek emergency treatment.

Always read the patient information leaflet before starting your treatment. The patient information can be found here

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