Clinical Practice Research Datalink (CPRD) is a research service supported by the Medicines and Healthcare products Regulatory Agency and the National Institute for Health Research, that has been trusted by GPs for the past 30 years to collect anonymised patient data for vital public health research, such as demonstrating the safety of the MMR vaccine and the whooping cough vaccine in pregnant women. In return for contributing anonymised data to CPRD, GP practices receive free, confidential practice-level prescribing and patient safety quality improvement (QI) reports, to enable patient case finding and national practice bench marking. Case review from QI reports can be used in annual appraisals, revalidation and evidence of GP practice QI activities. Practices also have the opportunity to earn extra income from participating in CPRD supported research questionnaires and clinical studies. Joining CPRD is a simple, quick, one-off process and is endorsed by NHS England and RCGP. Find out more about the benefits and join the 2000+ GP practices already contributing to CPRD at