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This gap limits our understanding of the effects of polysubstance use and how these differ from single substance use. Here, we examined the impact of single versus polysubstance exposure of fentanyl and methamphetamine on locomotor sensitisation and social behaviour in male and female rats. In addition, as recent evidence has suggested the potential for psychedelic compounds to decrease facets of both opioid and stimulant use disorders, we tested whether the psychedelic R\u2010(\u2212)2,5\u2010dimethoxy\u20104\u2010iodoamphetamine (DOI) can reverse drug withdrawal\u2010induced social deficits. Baseline sociability was assessed in male and female Sprague\u2013Dawley rats using DeepLabCut and Simple Behavioral Analysis (SimBA). Rats then received injections of saline, methamphetamine (1\u2009mg\/kg) and\/or fentanyl (20\u2009\u03bcg\/kg) for 14\u2009days, and locomotion was measured. All rats then underwent 10\u2009days of withdrawal followed by a reassessment of sociability. The following day, all subjects received DOI (0.3\u2009mg\/kg; 30\u2009min) and were reassessed for sociability. Our results indicate that the development of locomotor sensitisation and drug withdrawal\u2010induced social deficits vary as a function of drug class, drug history and sex. In addition, acute DOI treatment is sufficient to reverse social deficits as well as enhance social interactions in females. The findings from these experiments suggest a potential therapeutic role of psychedelics in mitigating the social deficits that are associated with withdrawal from polysubstance use of opioids and stimulants.<\/jats:p>","DOI":"10.1111\/adb.70132","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T16:26:06Z","timestamp":1772987166000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Fentanyl, Methamphetamine and Polysubstance Use Differentially Affect Locomotor Sensitisation and Social Behaviour in Rats: Psychedelic Treatment Reverses Social Deficits"],"prefix":"10.1111","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7065-6748","authenticated-orcid":false,"given":"Leah\u00a0M.","family":"Salinsky","sequence":"first","affiliation":[{"name":"Addictions, Drug &amp; Alcohol Institute, School of Medicine University of Washington  Seattle USA"},{"name":"Department of Psychiatry &amp; Behavioral Sciences, School of Medicine University of Washington  Seattle USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyra\u00a0C.","family":"Diaz","sequence":"additional","affiliation":[{"name":"Center for the Neurobiology of Addiction, Pain and Emotion University of Washington  Seattle USA"},{"name":"Addictions, Drug &amp; Alcohol Institute, School of Medicine University of Washington  Seattle USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua\u00a0L.","family":"Fox","sequence":"additional","affiliation":[{"name":"Center for the Neurobiology of Addiction, Pain and Emotion University of Washington  Seattle USA"},{"name":"Addictions, Drug &amp; Alcohol Institute, School of Medicine University of Washington  Seattle USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shawn\u00a0M.","family":"Panh","sequence":"additional","affiliation":[{"name":"Center for the Neurobiology of Addiction, Pain and Emotion University of Washington  Seattle USA"},{"name":"Addictions, Drug &amp; Alcohol Institute, School of Medicine University of Washington  Seattle USA"},{"name":"Department of Psychiatry &amp; Behavioral Sciences, School of Medicine University of Washington  Seattle USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2840-757X","authenticated-orcid":false,"given":"Susan\u00a0M.","family":"Ferguson","sequence":"additional","affiliation":[{"name":"Center for the Neurobiology of Addiction, Pain and Emotion University of Washington  Seattle USA"},{"name":"Addictions, Drug &amp; Alcohol Institute, School of Medicine University of Washington  Seattle USA"},{"name":"Department of Psychiatry &amp; Behavioral Sciences, School of Medicine University of Washington  Seattle USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,3,5]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"crossref","unstructured":"M. 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