Safety - Pfizer/BioNTech COVID-19 vaccine

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 first COVID-19 vaccine to be approved for use in Ireland by the EMA was the Pfizer/BioNTech COVID-19 vaccine. Its official name is "Comirnaty".

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.

Read about how COVID-19 mRNA vaccines work

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.

Read about COVID-19 vaccine development

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: 27 May 2021 at 5.30pm