Online Prescription

Injectable Anaphylaxis Treatment

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Had forgotten to get a script the last time I was with my GP. Webdoctor approved and sent my prescription to my local pharmacy the same day. Perfect.

—Sarah, 7th October 2022

What is an Injectable Anaphylaxis Treatment and What is It Used For?

An Injectable Anaphylaxis Treatment is an adrenaline auto-injector (AAI) used to treat anaphylaxis, a potentially life threatening emergency that requires immediate medical attention.

These are pre-fill pens that contain adrenaline, which is the first line treatment for an anaphylactic allergic reaction.

If you have had a previous prescription for an Injectable Anaphylaxis pen and have been trained how to use it , we can issue a prescription for this emergency medication, subject to clinical suitability.

Important Medical Information

Who is this service suitable for?

This service is suitable for people who:

  • Are aged 17 years and over
  • Have been diagnosed by a doctor with a severe allergy/ anaphylaxis that requires you to carry an adrenaline pen at all times
  • Can provide proof of a previous adrenaline pen prescription:
    • A consultant’s letter with details of your allergy
    • A picture of your adrenaline pen box that shows your name, date of birth and pharmacy details
  • Have been trained on how to use an adrenaline pen, are confident in its use
  • Know the signs and symptoms of a severe allergic attack
Who is this service not suitable for?

This service is not suitable for people who:

  • Are under the age of 17

  • Are requesting treatment for someone other than themselves 

  • Have not had a prescription for an adrenaline pen before

  • Have not had or used an adrenaline pen for some time

  • Want to change to a different adrenaline pen

  • Are not confident with the injection technique for your specific adrenaline pen 

  • Do not know the signs and symptoms of a severe allergic attack

What is anaphylaxis?
Anaphylaxis is a severe allergic reaction and is a life-threatening emergency.It requires immediate medical attention.

It is caused by the overwhelming reaction of the body’s immune system to a specific substance (allergen) that the body mistakenly thinks is attacking it. This reaction can begin seconds or minutes after being exposed to an allergen.

Here is some more information about anaphylaxis.

What are the symptoms of anaphylaxis?
Anaphylaxis leads the immune system to unleash a flood of chemicals that send you into shock – your blood pressure drops abruptly and your airways narrow, making it difficult to breathe.

This usually begins unexpectedly and rapidly progresses.

The most common symptoms include very rapid onset of:

  • Swelling of the lips, tongue and throat
  • Generalised rash – usually itchy and raised (like hives)
  • Wheeze (and difficulty breathing)
  • Fainting or collapsing due to low blood pressure
  • Rapid heartbeat
What causes anaphylaxis or severe allergic attacks?

Anaphylaxis occurs when the body's immune system, or natural defence system, overreacts to a trigger allergen.

This is often something you are frequently allergic to, but this is not always the case.

The following are common anaphylactic triggers:

  • Foods – nuts, eggs, fish

  • Medication – antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs) e.g. Aspirin

  • Insect bites or stings – bees, wasps, ants

  • General anaesthetic drugs

  • Contrast agents (dyes) – used in medical tests or scans 

  • Latex – rubber gloves, condoms

In as many as 1 in 4 cases of anaphylaxis, no trigger can be identified despite extensive testing. This is known as Idiopathic Anaphylaxis. 

How is anaphylaxis treated?

Your injectable anaphylaxis pen  contains a drug called adrenaline. This should be given immediately if there is any concern that an anaphylactic reaction is starting. You should give this if you think you are having an anaphylactic reaction, even if you are not sure.

It is essential that you dial 999 or 112, stating ANAPHYLAXIS, if you suspect an anaphylactic reaction is happening to enable urgent medical assessment. 

This should be done even if an injectable anaphylaxis pen has been administered and the symptoms are settling.

In some cases, an additional dose of adrenaline will be needed, and a second injectable anaphylaxis pen   will be required:

  • If the person does not respond to the initial dose after 5 minutes
  • If symptoms start to return
  • If there is a fault with the first pen

This is why it is advised that you always have access to 2 pre-filled adrenaline pens.

What is adrenaline?
Adrenaline is the most important treatment for severe allergic reactions (anaphylaxis).

Pre-filled adrenaline pens are known as adrenaline auto injectors (AAI), meaning they can be used to self administer a dose of adrenaline.

Adrenaline is known as epinephrine in some countries.

How does Injectable Anaphylaxis Treatment help with the treatment of anaphylaxis?

During an anaphylactic reaction, the chemicals that are released cause very serious symptoms:

  • Sudden drop in blood pressure
  • Narrowing of the airways and swelling of the lips/ tongue which can lead to breathing difficulties

The adrenaline in the injectable pen acts rapidly to treat these potentially life threatening symptoms of anaphylaxis so your blood pressure returns to normal and you can breathe more easily.

It can also help to alleviate other symptoms such as rashes and itch.

It is most effective if given within the first few minutes of a severe allergic reaction.

What are the potential side effects of using an injectable anaphylaxis pen?

Examples of side effects include:

  • Rapid heart rate & palpitations
  • High blood pressure
  • Nausea & vomiting
  • Sweating
  • Dizziness, tremor
  • Agitation & anxiety
  • Headache
  • Breathing difficulties

For a full list of the potential side effects, read the information leaflet that comes with your medication .

The risk profile for pre-filled adrenaline pens is very good, if used correctly.

It is important to be aware that there is no reason not to use an injectable anaphylaxis pen if someone is having an anaphylactic reaction.

How should I store my adrenaline pen?

Injectable anaphylaxis pens (or any AAIs) should be stored:

  • In a cool, dark place at room temperature, between 15-25°C – DO NOT refrigerate, as temperatures below 15°C may harm the injector device
  • In an insulated wallet if the person carrying the injector is outside for an extended period of time e.g. hiking
  • In a safe place where they are easily accessible

People at risk of anaphylaxis follow the advice of their allergy specialist on when to carry injectable anaphylaxis pens.

When should I replace my adrenaline pen?

You should replace your adrenaline pen if:

  • The injector has passed, or is in the month of expiry 

  • The solution has is discoloured 

  • There are solid particles within the solution 

  • There are any signs of damage or leakage 

You should dispose of the injector if you suspect any of the above.

Where can I get adrenaline pen training?
To use this service, you should have received training in the use of the adrenaline pen you are requesting a prescription for and feel confident to administer this if necessary. It is important that you request the device that you are familiar with as there are variations in how each device is operated, and specific training is required for each individual pen.

Each branded product has patient resources with clear information on this, and you should review this regularly. Ensure friends, family and work colleagues are trained to use the device.

Remember, not all AAI devices are the same and specific training is required for each individual device.

Is there important medical information I should be aware of?
  • Adrenaline pen devices are single use devices and cannot be reused, even if some adrenaline remains inside the device.
  • Regularly check your AAI devices  to ensure they are in date. (You can set a reminder on your phone). The shelf life of these devices is usually 12-18 months.
  • Always keep an adrenaline pen on hand since you never know when you might need it!
  • The most prevalent causes of death from severe allergies are not having the injector with you and waiting too long to use adrenaline during an allergic reaction.
  • If you have asthma, you are at risk of a more severe reaction – ensure your asthma symptoms are well controlled.
  • If you have any concerns, consult with your doctor. You can book an appointment online to see one of our Irish registered GPs.

Emergency Treatments Prescribes for Anaphylaxis

Avoid the waiting room! No need to queue up in person for an appointment when you can request a prescription online with One of our Irish-registered doctors will assess you and, if suitable, give you a prescription for an adrenaline pen from as little as €30.

Treatments Prescribed

  • Injectable Adrenaline Pens

How It Works

Requesting a prescription for an Injectable Anaphylaxis Treatment couldn’t be easier with! Simply fill in a medical questionnaire and a prescription will be issued if clinically suitable.

Step 1

Online Questionnaire

Complete a short and secure online questionnaire from your phone, tablet or laptop – it only takes a couple of minutes.

Step 2

Medical Review

One of our Irish-registered doctors will review your request to ensure this treatment is medically suitable and safe for you. If our doctor requires further clinical information to help safely assess your request, they will send you a message via your secure patient account.

Step 3

Decision Made

Once approved, we will send your prescription directly to an Irish pharmacy of your choice using secure Healthmail.

Why Choose


All of our doctors are registered with the Irish Medical Council and provide convenient and confidential healthcare to our patients.


The same doctor-patient confidentiality exists as in a regular face-to-face consultation, so you’ll be in good hands.

Caring was created by and is led by medical professionals, so patient safety is always our priority.


From the comfort of home, avail of instant access to medical expertise, including evenings & weekends.


Affordable healthcare with prescriptions (subject to clinical suitability) from just €30 and video consultations starting from €49.

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