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It is unclear whether quetiapine increases the risk of fatal methadone poisoning or if it is merely detected due to widespread use. We hypothesized that methadone and quetiapine would have additive toxic effects on respiratory rate, blood pressure, and the QTc\u2010interval. To investigate this hypothesis, we used telemetry implants for measurements of respiratory rate, haemodynamic variables, the velocity of blood pressure changes, temperature, and movement in conscious, freely moving male Wistar rats aged 12\u201313\u2009weeks. The combined effects of three accumulative i.p. doses of methadone (2.5, 10, 15\u2009mg\/kg) and quetiapine (3, 10, 30\u2009mg\/kg) were compared to rats treated with the same doses of each drug alone, and a vehicle\u2010treated group in a randomized investigator blinded study. No additive effects of quetiapine and methadone on respiratory rate, haemodynamic variables, or movement were observed. However, body temperature was significantly lower by approximately 1.5\u00b0C on average in the group treated with both methadone and quetiapine (15\u2009+\u200930\u2009mg\/kg) compared to the other groups. This indicates a synergistic effect of quetiapine and methadone on thermoregulation, which may increase the risk of fatal poisoning. We suggest studying this finding further in human settings.<\/jats:p>","DOI":"10.1111\/adb.13320","type":"journal-article","created":{"date-parts":[[2023,8,21]],"date-time":"2023-08-21T21:00:00Z","timestamp":1692651600000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Combined effects of methadone and quetiapine on respiratory rate, haemodynamic variables, and temperature in conscious rats"],"prefix":"10.1111","volume":"28","author":[{"given":"Freja Drost","family":"Andersen","sequence":"first","affiliation":[{"name":"Department of Forensic Medicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6516-694X","authenticated-orcid":false,"given":"Simon Comerma","family":"Steffensen","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Denmark"},{"name":"Department of Biomedical Sciences\/AnimalPhysiology Central University of Venezuela  Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simon Tilma","family":"Vistisen","sequence":"additional","affiliation":[{"name":"Department of Clinical Medicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Estefano","family":"Pinilla","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7950-4647","authenticated-orcid":false,"given":"Tina Myhre","family":"Pedersen","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vladimir","family":"Matchkov","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ulf","family":"Simonsen","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0543-6519","authenticated-orcid":false,"given":"Charlotte Uggerh\u00f8j","family":"Andersen","sequence":"additional","affiliation":[{"name":"Department of Forensic Medicine Aarhus University  Denmark"},{"name":"Department of Biomedicine Aarhus University  Denmark"},{"name":"Department of Clinical Pharmacology Aarhus University Hospital  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,8,18]]},"reference":[{"key":"e_1_2_10_2_1","unstructured":"UNODC (United Nations Office on Drugs and Crime): Word Drug Report20223:https:\/\/www.unodc.org\/res\/wdr2022\/MS\/WDR22_Booklet_3.pdf"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugalcdep.2022.109703"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.forsciint.2020.110343"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/adb.13214"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.h2698"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1177\/1178221819844205"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.4137\/SART.S7090"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.amjcard.2004.11.055"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.2165\/00002018\u2010200023040\u201000003"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.annemergmed.2008.03.016"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1177\/0271678X20943823"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/bph.12856"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejphar.2019.172820"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.lfs.2017.08.006"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00213\u2010006\u20100577\u2010y"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugalcdep.2012.12.020"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.3389\/fphar.2018.01023"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1096\/fj.07\u20109574LSF"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12247\u2010015\u20109232\u20107"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/bph.13868"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.22456\/1679\u20109216.80769"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejphar.2010.05.038"},{"key":"e_1_2_10_24_1","unstructured":"Knowledgebase G. 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