Mr Graham Crawley
10 South Colonnade
28th June 2021
Dear Mr Crawley,
Thank you for contacting the MHRA regarding the reports we have received concerning the Oxford
University/AstraZeneca and Pfizer/BioNTech COVID-19 vaccines.
Under the Freedom of Information (FOI) act, you have requested to be provided with the following: “Please provide the following information for the AstraZeneca ChAdOx1-S and Pfizer/BioNTech BNT162b2
What adverse reactions have been reported so far in 2021 for each vaccine by or on behalf of vaccinees
who were taking warfarin, apixaban or other anti-coagulants at the time of vaccination”
Unfortunately, we are unable to provide details of concomitant medications for individual cases. Because
of the way this information is captured within our database, this would require manual extraction of the
information from each individual case.
I can confirm that the MHRA does hold some of the information that you have requested. However, we
have also determined that the information is exempt under Section 12 of the Freedom of Information Act
and we cannot process your request any further.
Section 12 of the Act allows public authorities to refuse requests where the cost of dealing with them would
exceed the appropriate limit, which for central government is set at £600. This represents the estimated
cost of one person spending 24 working hours in determining whether the department holds the
information, locating, retrieving and extracting the information. Please be reassured that any information
provided regarding a patient’s drug history, concomitant medication or concurrent condition is considered
during the routine assessment of all cases that we receive.
The MHRA is not aware of any robust evidence which suggests that individuals taking any of the
medications, or classes of medications mentioned, are at increased risk of any particular adverse
reactions, nor whether these individuals are at increased risk of more severe adverse reactions than those
who do not take these medications.
As a precaution, we encourage patients who are taking other medications to discuss any concerns with
their doctor or pharmacist, who will be in the best position to advise them.
The MHRA is committed to transparency and as you may be aware, we are publishing a weekly summary
of Yellow Card reporting which can be found on this link: https://www.gov.uk/government/publications/coronavirus-covid-19-vaccine-adverse-reactions/coronavirus-
In this publication, you will find information on the reports that
we have received for each of the approved COVID-19 vaccines.
It is important to note that Yellow Card reports are not proof of a side effect occurring due to a vaccine but
a suspicion by the reporter that the medicine or vaccine may have caused the side effect. Each year,
millions of doses of routine vaccines are given in the UK alone, and when any vaccine is administered to
very large numbers of people, some recipients will inevitably experience illness following vaccination. The
fact that symptoms or events occur after use of a vaccine, and are reported via the Yellow Card scheme,
does not in itself mean that they are proven to have been caused by the vaccine. Underlying or concurrent
illnesses may be responsible and such events can also be coincidental.
Dr June Raine, MHRA Chief Executive, said:
“Over 44 million doses of vaccines against COVID-19 have now been administered in the UK, saving
thousands of lives through the biggest vaccination programme that has ever taken place in this country.”
“It is still vitally important that people come forward for their vaccination when invited to do so.”
“We ask anyone who suspects they have experienced a side effect linked with their COVID-19 vaccine to
report it to the Coronavirus Yellow Card website.”
I hope the information provided is helpful, but if you are dissatisfied with the handling of your request, you
have the right to ask for an internal review. Internal review requests should be submitted within two months
of the date of this response; and can be addressed to this email address.
Vigilance and Risk Management of Medicines Division
The MHRA information supplied in response to your request is subject to Crown copyright. The FOIA only entitles you to
access to MHRA information.
If you have a query about this email, please contact us. If you are unhappy with our decision, you may ask for it to be reviewed.
That review will be undertaken by a senior member of the Agency who has not previously been involved in your request. If
you wish to pursue that option please write to the Communications Directorate, Medicines and Healthcare products Regulatory
Agency, (via this email address). After that, if you remain dissatisfied, you may ask the Information Commissioner at:
The Information Commissioner’s Office
The information supplied in response to your request is the copyright of MHRA and/or a third party or parties and has been
supplied for your personal use only. You may not sell, resell or otherwise use any information provided without prior agreement
from the copyright holder.