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This prompted the World Health Organization to set up the International Nonproprietary Naming Committee in the 1970s to select unambiguous names for drugs. Unfortunately, multidrug products\u2014which are becoming increasingly popular\u2014do not fall under the remit of conventional International Non\u2010proprietary Nomenclature. We have identified 26 combination formulations that have been historically named with the co\u2010drug format in the United Kingdom. Most of them have also been prescribed in the United Kingdom in the past year, and although several of them are not prescribed very often, 11 were prescribed more than 2000 times. In this paper, we have explored the literature to identify prescribing errors with co\u2010drug products and found several idiosyncrasies that have caused drug errors in the past. We advocate for a standard nomenclature (state the international nonproprietary name [INN] of each component followed by dose information in the x\u2009+\u2009y format) for these products on the box and in prescribing resources. We hope that this will enhance clarity and safety during prescribing and administration, particularly for high\u2010volume drugs like paracetamol\u2009+\u2009codeine (co\u2010codamol), amoxicillin\u2009+\u2009clavulanic acid (co\u2010amoxiclav) and trimethoprim\u2009+\u2009sulfamethoxazole (co\u2010trimoxazole).<\/jats:p>","DOI":"10.1111\/bcp.16222","type":"journal-article","created":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T06:04:55Z","timestamp":1726034695000},"page":"2705-2712","source":"Crossref","is-referenced-by-count":1,"title":["Errors associated with co\u2010names of medicines: The nomenclature of combination medicinal products"],"prefix":"10.1111","volume":"90","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7369-4611","authenticated-orcid":false,"given":"Ois\u00edn N.","family":"Kavanagh","sequence":"first","affiliation":[{"name":"School of Pharmacy Newcastle University  Newcastle upon Tyne UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Lowe","sequence":"additional","affiliation":[{"name":"Pharmacy Department Hellesdon Hospital  Norwich UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1139-655X","authenticated-orcid":false,"given":"Jeffrey K.","family":"Aronson","sequence":"additional","affiliation":[{"name":"Centre for Evidence Based Medicine, Nuffield Department of Primary Care Health Sciences University of Oxford  Oxford UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,9,10]]},"reference":[{"volume-title":"Guidelines on the Use of International Nonproprietary Names (INNs) for Pharmaceutical Substances","year":"1997","author":"World Health Organization","key":"e_1_2_6_2_1"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1097\/00005650\u2010199912000\u201000005"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1093\/ajhp\/zxac052"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1518\/001872006776412199"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/bcp.14644"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jconrel.2018.05.024"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jconrel.2024.03.034"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1136\/jcp.24.5.430"},{"key":"e_1_2_6_10_1","unstructured":"Anonymous.Branded generics [internet].Community Pharmacy England. 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