[
  {
    "phenotype_id": "PH3808",
    "phenotype_version_id": 8961,
    "name": "Warfarin",
    "definition": "This codelist was taken from [OpenCodelists](https://www.opencodelists.org/), created by [OpenSAFELY](https://www.opensafely.org/). We recommend viewing this Phenotype on the OpenCodelist website to view the most recent version.\n\n\nThis is a codelist to identify all warfarin preparations in the [NHS dictionary of medicines and devices](https://ebmdatalab.net/what-is-the-dmd-the-nhs-dictionary-of-medicines-and-devices/).\n\n\n© University of Oxford for the Bennett Institute for Applied Data Science 2025\\. This work may be copied freely for non\\-commercial research and study.\n\n",
    "implementation": null,
    "publications": null,
    "validation": null,
    "citation_requirements": null,
    "created": "2026-01-26T23:35:16.310355Z",
    "author": "OpenSAFELY",
    "collections": [
      {
        "name": "OpenCodelist",
        "value": 31
      },
      {
        "name": "Phenotype Library",
        "value": 18
      }
    ],
    "tags": null,
    "organisation": {
      "id": 1,
      "slug": "opensafely",
      "name": "OpenSAFELY"
    },
    "world_access": 1,
    "updated": "2026-01-26T23:35:16.305164Z",
    "references": [
      {
        "url": "https://github.com/ebmdatalab/anticoagulant-covid-codelist-notebook/blob/master/notebooks/anticoagulants.ipynb",
        "title": "Jupyter Notebook"
      },
      {
        "url": "https://github.com/opensafely/anticoagulants-research/issues/3",
        "title": "GitHub Discussion"
      }
    ],
    "signed_off": [],
    "methodology": "All preparation beginning with the [BNF code](https://ebmdatalab.net/prescribing-data-bnf-codes/) `0208020V0` were identified and mapped dm\\+d products for these were included.\n\n",
    "coding_system": [
      {
        "name": "dm+d codes",
        "value": 23
      }
    ],
    "open_codelist_id": "opensafely/warfarin",
    "source_reference": "https://www.opencodelists.org/codelist/opensafely/warfarin/2020-10-05",
    "concept_information": [
      {
        "concept_id": 9138,
        "concept_version_id": 16623,
        "concept_name": "opensafely/warfarin/2020-10-05",
        "coding_system": {
          "id": 23,
          "name": "dm+d codes",
          "description": "dm+d codes"
        },
        "phenotype_id": "PH3808",
        "phenotype_version_id": 8961,
        "phenotype_name": "Warfarin",
        "code_attribute_header": [
          "id",
          "type",
          "bnf_code",
          "chemical"
        ],
        "codes": [
          {
            "code": "10138911000001108",
            "description": "Warfarin 1mg tablets (Zentiva)",
            "attributes": {
              "id": "10138911000001108",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10139111000001103",
            "description": "Warfarin 3mg tablets (Zentiva)",
            "attributes": {
              "id": "10139111000001103",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10139311000001101",
            "description": "Warfarin 5mg tablets (Zentiva)",
            "attributes": {
              "id": "10139311000001101",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10305211000001109",
            "description": "Warfarin 500microgram tablets (Actavis UK Ltd)",
            "attributes": {
              "id": "10305211000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10417011000001103",
            "description": "Warfarin 500microgram tablets (Arrow Generics Ltd)",
            "attributes": {
              "id": "10417011000001103",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10418211000001107",
            "description": "Warfarin 1mg tablets (Arrow Generics Ltd)",
            "attributes": {
              "id": "10418211000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10418411000001106",
            "description": "Warfarin 3mg tablets (Arrow Generics Ltd)",
            "attributes": {
              "id": "10418411000001106",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10418611000001109",
            "description": "Warfarin 5mg tablets (Arrow Generics Ltd)",
            "attributes": {
              "id": "10418611000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "10733911000001106",
            "description": "Warfarin 500microgram tablets (Zentiva)",
            "attributes": {
              "id": "10733911000001106",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12957311000001102",
            "description": "Warfarin 1.5mg/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12957311000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAARAR",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12958011000001104",
            "description": "Warfarin 100micrograms/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12958011000001104",
              "type": "amp",
              "bnf_code": "0208020V0AAATAT",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12958511000001107",
            "description": "Warfarin 2.5mg/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12958511000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAAUAU",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12959011000001109",
            "description": "Warfarin 25mg/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12959011000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAAKAK",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12959411000001100",
            "description": "Warfarin 4.16mg/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12959411000001100",
              "type": "amp",
              "bnf_code": "0208020V0AAAPAP",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12960011000001105",
            "description": "Warfarin 4mg/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12960011000001105",
              "type": "amp",
              "bnf_code": "0208020V0AAAWAW",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "12961311000001103",
            "description": "Warfarin 500micrograms/5ml oral solution (Special Order)",
            "attributes": {
              "id": "12961311000001103",
              "type": "amp",
              "bnf_code": "0208020V0AAAXAX",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13016611000001102",
            "description": "Warfarin 1.5mg/5ml oral solution",
            "attributes": {
              "id": "13016611000001102",
              "type": "vmp",
              "bnf_code": "0208020V0AAARAR",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13016711000001106",
            "description": "Warfarin 100micrograms/5ml oral solution",
            "attributes": {
              "id": "13016711000001106",
              "type": "vmp",
              "bnf_code": "0208020V0AAATAT",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13016811000001103",
            "description": "Warfarin 2.5mg/5ml oral solution",
            "attributes": {
              "id": "13016811000001103",
              "type": "vmp",
              "bnf_code": "0208020V0AAAUAU",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13016911000001108",
            "description": "Warfarin 25mg/5ml oral solution",
            "attributes": {
              "id": "13016911000001108",
              "type": "vmp",
              "bnf_code": "0208020V0AAAKAK",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13017011000001107",
            "description": "Warfarin 4.16mg/5ml oral solution",
            "attributes": {
              "id": "13017011000001107",
              "type": "vmp",
              "bnf_code": "0208020V0AAAPAP",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13017111000001108",
            "description": "Warfarin 4mg/5ml oral solution",
            "attributes": {
              "id": "13017111000001108",
              "type": "vmp",
              "bnf_code": "0208020V0AAAWAW",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "13017211000001102",
            "description": "Warfarin 500micrograms/5ml oral solution",
            "attributes": {
              "id": "13017211000001102",
              "type": "vmp",
              "bnf_code": "0208020V0AAAXAX",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "15202611000001100",
            "description": "Warfarin 500microgram tablets (Sigma Pharmaceuticals Plc)",
            "attributes": {
              "id": "15202611000001100",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "16071211000001106",
            "description": "Warfarin 1mg tablets (Bristol Laboratories Ltd)",
            "attributes": {
              "id": "16071211000001106",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "16071411000001105",
            "description": "Warfarin 3mg tablets (Bristol Laboratories Ltd)",
            "attributes": {
              "id": "16071411000001105",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "16071611000001108",
            "description": "Warfarin 5mg tablets (Bristol Laboratories Ltd)",
            "attributes": {
              "id": "16071611000001108",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "17876511000001102",
            "description": "Warfarin 500microgram tablets (Phoenix Healthcare Distribution Ltd)",
            "attributes": {
              "id": "17876511000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "17876711000001107",
            "description": "Warfarin 1mg tablets (Phoenix Healthcare Distribution Ltd)",
            "attributes": {
              "id": "17876711000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "17876911000001109",
            "description": "Warfarin 3mg tablets (Phoenix Healthcare Distribution Ltd)",
            "attributes": {
              "id": "17876911000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "17877111000001109",
            "description": "Warfarin 5mg tablets (Phoenix Healthcare Distribution Ltd)",
            "attributes": {
              "id": "17877111000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "18288311000001103",
            "description": "Warfarin 1mg/ml oral suspension sugar free (Rosemont Pharmaceuticals Ltd)",
            "attributes": {
              "id": "18288311000001103",
              "type": "amp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "18290011000001102",
            "description": "Warfarin 1mg/ml oral suspension sugar free",
            "attributes": {
              "id": "18290011000001102",
              "type": "vmp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "18509011000001102",
            "description": "Coumadin 4mg tablets (Imported (Canada))",
            "attributes": {
              "id": "18509011000001102",
              "type": "amp",
              "bnf_code": "0208020V0BDAAAC",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "18723611000001101",
            "description": "Warfarin 1mg/ml oral suspension sugar free (Alliance Healthcare (Distribution) Ltd)",
            "attributes": {
              "id": "18723611000001101",
              "type": "amp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "19835411000001102",
            "description": "Warfarin 1mg tablets (APC Pharmaceuticals & Chemicals (Europe) Ltd)",
            "attributes": {
              "id": "19835411000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "19835611000001104",
            "description": "Warfarin 3mg tablets (APC Pharmaceuticals & Chemicals (Europe) Ltd)",
            "attributes": {
              "id": "19835611000001104",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "19835811000001100",
            "description": "Warfarin 5mg tablets (APC Pharmaceuticals & Chemicals (Europe) Ltd)",
            "attributes": {
              "id": "19835811000001100",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "20367411000001100",
            "description": "Warfarin 1mg/ml oral suspension sugar free (A A H Pharmaceuticals Ltd)",
            "attributes": {
              "id": "20367411000001100",
              "type": "amp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "204811000001109",
            "description": "Marevan 500microgram tablets (Advanz Pharma)",
            "attributes": {
              "id": "204811000001109",
              "type": "amp",
              "bnf_code": "0208020V0BBAFAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "20538311000001102",
            "description": "Warfarin 500microgram tablets (Advanz Pharma)",
            "attributes": {
              "id": "20538311000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "21919111000001103",
            "description": "Warfarin 1mg/ml oral suspension sugar free (Waymade Healthcare Plc)",
            "attributes": {
              "id": "21919111000001103",
              "type": "amp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "21919311000001101",
            "description": "Warfarin 500microgram tablets (Waymade Healthcare Plc)",
            "attributes": {
              "id": "21919311000001101",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "21919511000001107",
            "description": "Warfarin 1mg tablets (Waymade Healthcare Plc)",
            "attributes": {
              "id": "21919511000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "21919811000001105",
            "description": "Warfarin 3mg tablets (Waymade Healthcare Plc)",
            "attributes": {
              "id": "21919811000001105",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "21920111000001102",
            "description": "Warfarin 5mg tablets (Waymade Healthcare Plc)",
            "attributes": {
              "id": "21920111000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "22735311000001104",
            "description": "Warfarin 1mg tablets (DE Pharmaceuticals)",
            "attributes": {
              "id": "22735311000001104",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "22735611000001109",
            "description": "Warfarin 3mg tablets (DE Pharmaceuticals)",
            "attributes": {
              "id": "22735611000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "22736411000001102",
            "description": "Warfarin 5mg tablets (DE Pharmaceuticals)",
            "attributes": {
              "id": "22736411000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "22736711000001108",
            "description": "Warfarin 500microgram tablets (DE Pharmaceuticals)",
            "attributes": {
              "id": "22736711000001108",
              "type": "amp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "22736911000001105",
            "description": "Warfarin 1mg/ml oral suspension sugar free (DE Pharmaceuticals)",
            "attributes": {
              "id": "22736911000001105",
              "type": "amp",
              "bnf_code": "0208020V0AABBBB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "272711000001102",
            "description": "Warfarin 1mg tablets (IVAX Pharmaceuticals UK Ltd)",
            "attributes": {
              "id": "272711000001102",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "284011000001104",
            "description": "Marevan 3mg tablets (Advanz Pharma)",
            "attributes": {
              "id": "284011000001104",
              "type": "amp",
              "bnf_code": "0208020V0BBABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "28988911000001100",
            "description": "Warfarin 1mg tablets (Crescent Pharma Ltd)",
            "attributes": {
              "id": "28988911000001100",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "28989111000001105",
            "description": "Warfarin 3mg tablets (Crescent Pharma Ltd)",
            "attributes": {
              "id": "28989111000001105",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "28989311000001107",
            "description": "Warfarin 5mg tablets (Crescent Pharma Ltd)",
            "attributes": {
              "id": "28989311000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "303111000001107",
            "description": "Warfarin 1mg tablets (Actavis UK Ltd)",
            "attributes": {
              "id": "303111000001107",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "30945211000001105",
            "description": "Warfarin 1mg tablets (Mawdsley-Brooks & Company Ltd)",
            "attributes": {
              "id": "30945211000001105",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "30945411000001109",
            "description": "Warfarin 3mg tablets (Mawdsley-Brooks & Company Ltd)",
            "attributes": {
              "id": "30945411000001109",
              "type": "amp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "30945711000001103",
            "description": "Warfarin 5mg tablets (Mawdsley-Brooks & Company Ltd)",
            "attributes": {
              "id": "30945711000001103",
              "type": "amp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "319733000",
            "description": "Warfarin 1mg tablets",
            "attributes": {
              "id": "319733000",
              "type": "vmp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "319734006",
            "description": "Warfarin 3mg tablets",
            "attributes": {
              "id": "319734006",
              "type": "vmp",
              "bnf_code": "0208020V0AAABAB",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "319735007",
            "description": "Warfarin 5mg tablets",
            "attributes": {
              "id": "319735007",
              "type": "vmp",
              "bnf_code": "0208020V0AAADAD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "319736008",
            "description": "Warfarin 500microgram tablets",
            "attributes": {
              "id": "319736008",
              "type": "vmp",
              "bnf_code": "0208020V0AAASAS",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "321511000001106",
            "description": "Warfarin 1mg tablets (Sandoz Ltd)",
            "attributes": {
              "id": "321511000001106",
              "type": "amp",
              "bnf_code": "0208020V0AAAAAA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "32741911000001103",
            "description": "Warfarin 5mg capsules (Special Order)",
            "attributes": {
              "id": "32741911000001103",
              "type": "amp",
              "bnf_code": "0208020V0AABDBD",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "32742211000001100",
            "description": "Warfarin 3mg capsules (Special Order)",
            "attributes": {
              "id": "32742211000001100",
              "type": "amp",
              "bnf_code": "0208020V0AABCBC",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "32742511000001102",
            "description": "Warfarin 1mg capsules (Special Order)",
            "attributes": {
              "id": "32742511000001102",
              "type": "amp",
              "bnf_code": "0208020V0AABABA",
              "chemical": "Warfarin sodium"
            }
          },
          {
            "code": "32751111000001103",
            "description": "Warfarin 1mg capsules",
            "attributes": {
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