All vaccines are tested for safety and effectiveness before they can be used. The HSE only uses a vaccine if it meets the required standards of safety and effectiveness.
The Pfizer/BioNTech COVID-19 vaccine was the first COVID-19 vaccine to be approved for use in Ireland. Its official name is 'Comirnaty'.
Who should not get the Pfizer/BioNTech vaccine
Most people can safely get the Pfizer/BioNTech COVID-19 vaccine.
But this vaccine is not recommended if you:
- have had a severe allergic reaction to any of the ingredients in this vaccine or the Moderna vaccine - including polyethylene glycol or PEG
- have been told by a doctor that you should not get this vaccine or the Moderna vaccine - they are both mRNA vaccines
- have had a severe allergic reaction to a previous dose of this vaccine or the Moderna vaccine
- had myocarditis after a previous dose of this vaccine or the Moderna vaccine
Talk to your doctor before getting this vaccine if you:
- have had a severe allergic reaction (anaphylaxis) in the past, including to any other vaccine or medication
- had pericarditis after a previous dose of this vaccine or the Moderna vaccine
How COVID-19 mRNA vaccines work
Pfizer/BionTech is an mRNA vaccine. mRNA vaccines teach your body how to make a protein that will trigger an immune response, without using the live virus that causes COVID-19.
How COVID-19 vaccines were developed quickly
The work to develop COVID-19 vaccines moved much faster than usual to make them available as soon as possible.
Ingredients of Pfizer/BioNTech COVID-19 vaccine
The Pfizer/BioNTech COVID-19 vaccine does not contain eggs, preservatives or latex.
For a full list of ingredients, read the patient information leaflet for the Pfizer/BioNTech COVID-19 vaccine (Comirnaty).
This content was fact checked by vaccine experts working in Ireland.
Last updated: 11 August 2021 at 5.20pm