OpenCodelists

Welcome to OpenCodelists, created by OpenSAFELY for creating and sharing codelists.

Anybody can also use this tool to create and share codelists. To get started, take a look at the documentation or watch the videos.

If you would like to publish codelists on behalf of an organisation, please get in touch.

Below, you'll find all the codelists that have been used in OpenSAFELY research to date.

All codelists


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Metformin dm+d
This codelist aims to identify the prescribing of metformin, including in combination with other oral antidiabetic medications.
Published by OpenSAFELY
Metformin drug codes dm+d
Taken from the `METFORMIN_COD` NHS drug refset. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Published by NHS Drug Refsets
Methotrexate (oral) dm+d
dm+d codelist for oral methotrexate
Published by OpenSAFELY
Methotrexate - injectable dm+d
dm+d codelist for injectable methotrexate
Published by OpenSAFELY
Methotrexate - oral BNF
[BNF codelist](https://www.thedatalab.org/blog/161/prescribing-data-bnf-codes/) for oral methotrexate.
Published by OpenSAFELY
Methotrexate 10mg BNF
Used by the following [OpenPrescribing](https://openprescribing.net) measures:

* [Methotrexate 10 mg tablets ](https://openprescribing.net/measure/methotrexate/)
Published by OpenPrescribing
Methotrexate 2.5mg and 10mg BNF
Used by the following [OpenPrescribing](https://openprescribing.net) measures:

* [Methotrexate 10 mg tablets ](https://openprescribing.net/measure/methotrexate/)
Published by OpenPrescribing
Methotrexate Rx dm+d
Taken from the `MET_COD` field in the National PINCER Data Specification, published by PRIMIS.

© PRIMIS - the University of Nottingham 2021
Published by PINCER
Methotrexate medication codes dm+d
Taken from the `METHOTREXDRUG_COD` NHS drug refset. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Published by NHS Drug Refsets
Methylphenidate BNF
pseudoBNF codelist for methylphenidate
Published by OpenSAFELY
Methylphenidate - dmd dm+d
dm+d codelist for methylphenidate
Published by OpenSAFELY
Metronidazole dm+d
Metronidazole
Metronidazole, tinidazole and ornidazole (antibacterials) dm+d
Metronidazole, tinidazole and ornidazole codelist extracted from antibacterials codelist (https://www.opencodelists.org/codelist/opensafely/antibacterials/27089eaa/)
Published by UKHSA
Miconazole nitrate dm+d
Miconazole

Updated July 20, 2026
Midazolam BNF
Midazolam that is generally prescribed at the end of life.
Published by OpenSAFELY