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Reporting Side Effects

Patient safety is our first priority.

We encourage healthcare professionals, patients and the general public to report any information about the safety, quality or performance of a Pfizer product. This includes potential adverse events, reports on certain circumstances which may increase a patient’s risk of encountering an adverse event, as well as other reportable information, including product complaints and unexpected therapeutic effects.

All Pfizer employees play a critical role in meeting our legal and ethical responsibilities to collect and analyse reports, and are fully trained in how to recognise and report an adverse event. We have to report all such events to the regulatory bodies, whether or not we can confirm their accuracy.

What to do if you experience side effects whilst taking a Pfizer medicine

If you are taking or are prescribed a Pfizer medicine and experience any side effects, you should immediately report these to your doctor or to another healthcare professional (such as a nurse or a carer).

If you have any concerns about a specific Pfizer medication (bearing the Pfizer logo) you can contact Pfizer Medical Information in the United Kingdom on

01304 616161

The Medicines and Healthcare Products Regulatory Agency (MHRA) can be contacted through its Yellow Card reporting system.

What to do if you experience side effects after receiving the COVID-19 mRNA vaccine

Adverse events should be reported. Reporting forms and information can be found at or search for MHRA Yellow Card in the Google Play or Apple App Store.

In addition, to report a suspected adverse event or side effect related to the COVID-19 mRNA Vaccine BNT162b2 directly to Pfizer, please use the link below: COVID-19 mRNA Vaccine BNT162b2 Safety reporting site. If you have a medical information enquiry including those with associated adverse events, contact Medical Information.

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PP-UNP-GBR-2993 / December 2022
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