Anaphylaxis and Auto-Injectors EpiPen Jext and Nefy Differences and How to Use Them

Anaphylaxis can move fast. A mild-looking allergic reaction can become a life-threatening emergency within minutes, especially when breathing, circulation, or consciousness are affected. The right device, used early, can save a life.

This guide explains what anaphylaxis is, how EpiPen, Jext, and Nefy differ, and how each device is generally used. It is general information only and does not replace advice from a doctor, pharmacist, allergy specialist, or your ASCIA Action Plan.

Keep an allergy emergency kit easy to find and ready to use.

What anaphylaxis looks like

Anaphylaxis is a severe allergic reaction that affects more than one body system, or causes serious breathing or circulation symptoms. Common triggers include foods, insect stings, medicines, and latex, although the trigger is not always obvious.

Milder allergy symptoms may include:

• Hives or welts

• Tingling around the mouth

• Swelling of the lips, face, or eyes

• Abdominal pain or vomiting, especially after food exposure

  
  

Signs that suggest anaphylaxis include:

• Difficult or noisy breathing

• Swelling of the tongue

• Swelling or tightness in the throat

• Wheeze or persistent cough

• Difficulty talking or a hoarse voice

• Dizziness, collapse, or becoming pale and floppy

• A sudden drop in alertness

  
  

For a person with a known food allergy, repeated vomiting or severe abdominal pain can also be a warning sign, especially when it happens soon after exposure.

Adrenaline is the first-line treatment for anaphylaxis. Antihistamines may help hives or itching, but they do not treat life-threatening breathing or circulation problems.

What to do first in an anaphylaxis emergency

If anaphylaxis is suspected, act quickly.

1. Lay the person flat

   
   

   Do not let them stand or walk. If breathing is difficult, they may sit with their legs outstretched. If they are unconscious or vomiting, place them on their side.

   
   

2. Give adrenaline immediately

   
   

Use the prescribed device according to its instructions. Do not wait to see if symptoms settle.

1. Call 000 for an ambulance

   
   

Say “anaphylaxis” clearly.

1. Give a second dose if needed

   
   

If there is no improvement after 5 minutes, or symptoms return, give another dose using a second device if available.

1. Monitor breathing and consciousness

   
   

Start CPR if the person becomes unresponsive and is not breathing normally.

After adrenaline is given, the person still needs medical assessment, even if they improve.

How EpiPen, Jext, and Nefy are different

EpiPen and Jext are adrenaline auto-injectors. They deliver adrenaline through a needle into the outer mid-thigh. Nefy, often written as NEFFY in some markets, is different because it is a nasal adrenaline spray rather than an injector.

Availability and approved use can vary by country, age, weight, and prescribing rules. In Australia, always follow the device prescribed by the treating doctor and the current ASCIA Action Plan.

Device	Type	How it delivers adrenaline	Main handling difference
EpiPen	Auto-injector	Needle into outer mid-thigh	Blue safety cap, orange needle end
Jext	Auto-injector	Needle into outer mid-thigh	Yellow cap, black injector tip
Nefy	Nasal spray	Spray into one nostril	No needle, single-use spray device

These devices are designed for emergency use by non-medical people. The key is to know the exact device in the allergy plan before an emergency happens.

How to use an EpiPen

EpiPen is one of the best-known adrenaline auto-injectors. It is usually used through clothing if needed, as long as the injection site is the outer mid-thigh and there are no bulky seams or objects in the way.

To use an EpiPen:

1. Form a firm fist around the device

   
   

   Keep fingers away from both ends.

   
   

2. Remove the blue safety cap

   
   

   The common reminder is “blue to the sky, orange to the thigh”.

   
   

3. Place the orange end against the outer mid-thigh

   
   

   Hold it at a right angle to the leg.

   
   

4. Push firmly until it clicks

   
   

   The click means the injection has started.

   
   

5. Hold it in place for 3 seconds

   
   

   Follow the current instructions supplied with the device.

   
   

6. Remove the EpiPen and call 000

   
   

   The orange end will cover the needle after use.

   
   

Do not inject into the hands, feet, buttock, or a vein. If a child is moving, hold the leg still to reduce the risk of injury.

How to use a Jext auto-injector

Jext is also an adrenaline auto-injector, but the colour cues and hold time differ from EpiPen. That means people should practise with the correct trainer device, not assume every injector works the same way.

To use Jext:

1. Grip the injector in your dominant hand

   
   

   Keep fingers away from the black tip.

   
   

2. Remove the yellow cap

   
   

   Once the cap is removed, the device is ready.

   
   

3. Place the black tip against the outer mid-thigh

   
   

   Hold it firmly at a right angle.

   
   

4. Push hard until you hear a click

   
   

   This starts the injection.

   
   

5. Hold it in place for 3 seconds

   
   

   Follow the device instructions and count slowly.

   
   

6. Remove the device

   
   

   Black sheath will cover the needle

7. 
   

   then call 000 if not already done.

   
   

Like EpiPen, Jext can usually be given through clothing in an emergency.

Practising with a trainer device makes the real emergency steps easier to remember.

How to use Nefy nasal adrenaline spray

Nefy is different because it does not use a needle. It delivers adrenaline into the nose as a spray. This may suit some people who have strong needle anxiety, but it still needs to be prescribed and used according to local approvals and the product instructions.

General steps for a single-use nasal adrenaline spray are:

1. Remove the spray from its packaging

   
   

Check that it is the correct device and dose for the person.

1. Place the nozzle into one nostril

   
   

The person does not need to inhale deeply for the spray to be given.

1. Press the plunger firmly

   
   

You will hear a click, this releases the dose.

1. Call 000 and monitor symptoms

   
   

If symptoms do not improve, or they return, follow the action plan for a second dose.

Nasal swelling, heavy congestion, or incorrect technique may affect how well any nasal medicine is delivered, so follow the prescriber’s advice closely.

Storage and practice matter

An emergency device only helps if it is available, in date, and familiar.

Keep these habits in place:

• Carry the device at all times if prescribed.

• Store it at room temperature and away from extreme heat.

• Check the expiry date regularly.

• Replace it if the liquid looks cloudy or discoloured, if the device instructions say to do so.

• Keep two doses available where possible.

• Practise with a trainer device, not a real injector.

• Make sure carers, family members, school staff, and coaches know where the device is kept.

• BUT if you ONLY have an out of date device, give, as something is better than nothing.

  
  

Written action plans are especially useful because people can freeze during an emergency. A clear plan removes guesswork.

The key takeaway

EpiPen and Jext are adrenaline auto-injectors used in the outer mid-thigh. Nefy is a nasal adrenaline spray and works differently.

If anaphylaxis is suspected, give adrenaline early, call 000, keep the person lying down or safely positioned, and give a second dose after about 5 minutes if symptoms do not improve. The best device is the one prescribed, carried, in date, and practised with before it is ever needed.