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.

We are unable to provide you with medical advice. However, we encourage you to speak to your doctor, pharmacist or to call NHS 111 if you are worried about your health.

Please do not stop taking your medicine without first seeking advice from your doctor or pharmacist.

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

For counterfeit or fake medicines or medical devices, including coronavirus testing kits, report as usual on the Yellow Card site.

For any queries involving counterfeit or fake medical devices contact devices.compliance@mhra.gov.uk