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Vaccine Monitor

Yellow Card Vaccine Monitor

The MHRA is monitoring suspected side effects to COVID-19 vaccines. Please register before you receive your vaccination by clicking 'Sign in or register'. If you have already received your vaccine, you can still sign up.

If you are registering you will be asked to read, and agree to, the signing up details and privacy statement before progressing. If you are logged in, select ‘My account’.

The purpose of this programme

The vaccine monitor is a data collection programme where individuals can register before receiving a vaccine. Participants will then be actively followed up after they have received a COVID-19 vaccination for information on their experience.

The MHRA also run the Coronavirus Yellow Card reporting site, for reporting suspected side effects to medicines or device incidents used in this pandemic, which anyone can report to.

How this site differs from other COVID-19 websites and apps

There are a number of COVID-19 Apps available; including NHS Covid-19 and the COVID Symptom Study app. The Yellow Card Vaccine Monitor is a standalone data collection platform which does not directly link to other COVID-19 websites or apps.

COVID-19 Vaccines

Vaccines are the most effective way to prevent infectious diseases and they save millions of lives worldwide. Like all medicines, vaccines can cause side effects. Most of these are mild and short-term, and not everyone gets them.

MHRA is responsible for continuously monitoring the safety of all medicines and vaccines once they are approved for use.

We have published a report summarising information received via the Yellow Card scheme which will be published regularly to include other safety investigations carried out by the MHRA under the COVID-19 Vaccine Surveillance Strategy.

More information on the possible side effects of Covid-19 vaccinations is available on the NHS website.


Reporting about other products

Report a suspected side effect to medicines or vaccines (if you are not participating in the Yellow Card Vaccine Monitor) used in coronavirus treatment on the Yellow Card Coronavirus Reporting site.

Report a medical device or diagnostic adverse incident used in coronavirus treatment on the Yellow Card Coronavirus Reporting site.

Report suspected side effects to all other medicines, vaccines, adverse incidents with medical devices, or fake products on the Yellow Card site or app.

If you are unsure which site to report to, please pick one – they all are received and assessed by the MHRA.

Where to go for medical advice

We are unable to provide medical advice.

If you are worried about your health please speak to your doctor, pharmacist or call NHS 111.

Visit Coronavirus (COVID-19): what you need to do to find out more about the government response to coronavirus.