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Drug\u2010 and alcohol\u2010related deaths in this population are being increasingly reported; however, toxicological detail is lacking. Using data reported to the National Programme on Substance Use Mortality, we identified 18 deaths in people who had previously undergone bariatric surgery. Opioids were detected in almost all cases and were frequently implicated in causing death. Multiple medications were detected at post\u2010mortem in every case and often included medications that the deceased was not actively prescribed. Mental health conditions and chronic pain were commonly listed comorbidities and one\u2010third of deaths were deemed suicide. Illicit drug and alcohol use was rare, highlighting a distinct vulnerability to prescription medication harms. Our findings emphasize a need to understand how bariatric surgery alters pharmacokinetics and for integrated, multidisciplinary aftercare, therapeutic drug monitoring and tailored education of safe medication use in bariatric surgery patients.<\/jats:p>","DOI":"10.1002\/bcp.70387","type":"journal-article","created":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T00:01:13Z","timestamp":1765843273000},"page":"1247-1255","source":"Crossref","is-referenced-by-count":0,"title":["Drug poisonings following bariatric surgery: Case series report"],"prefix":"10.1002","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-2953-243X","authenticated-orcid":false,"given":"Eman","family":"Mshari","sequence":"first","affiliation":[{"name":"Centre for Pharmaceutical Medicine Research, Institute of Pharmaceutical Science King's College London  London 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