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We investigated the prevalence of unintentional and intentional non-adherence to antiretroviral therapy (ART) and the relationship with beliefs about medicines, sociodemographic- and HIV-related variables among people with HIV (PWH) attending the HIV clinic of the Amsterdam University Medical Centers. Participants completed the Medication Adherence Rating Scale (MARS) and the Beliefs about Medicines (BMQ) questionnaire. About half of 80 participants reported unintentional non-adherence and 20% reported intentional non-adherence. Both unintentional and intentional non-adherence were associated with younger age. Additionally, intentional non-adherence was associated with being a migrant from Suriname \/Netherlands Antilles, having more concerns about negative effects of ART and stronger beliefs that medicines in general are overused\/ overprescribed. In conclusion, intentional but not unintentional non-adherence was associated with beliefs about medicines. Eliciting and discussing beliefs about medicines may be a promising avenue to address patients\u2019 concerns and perceptions thereby potentially enhancing medication adherence.<\/jats:p>","DOI":"10.1007\/s10461-022-03842-y","type":"journal-article","created":{"date-parts":[[2022,9,3]],"date-time":"2022-09-03T14:02:35Z","timestamp":1662213755000},"page":"1045-1054","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Intentional- but not Unintentional Medication Non-adherence was Related with Beliefs about Medicines Among a Multi-Ethnic Sample of People with HIV"],"prefix":"10.1007","volume":"27","author":[{"given":"Anjuly","family":"Castelan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeannine F","family":"Nellen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"van der Valk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2616-1414","authenticated-orcid":false,"given":"Pythia T","family":"Nieuwkerk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,9,3]]},"reference":[{"key":"3842_CR1","doi-asserted-by":"publisher","first-page":"1181","DOI":"10.1097\/00002030-200106150-00015","volume":"15","author":"DR Bangsberg","year":"2001","unstructured":"Bangsberg DR, Perry S, Charlebois ED, et al. 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MvdV has received grants and consultancy fees all paid to the institution from Gilead, MSD and ViiV.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of Interest"}},{"value":"This study was exempted from formal ethics approval since the Dutch Medical Research Involving Human Subjects Act (WMO) does not apply (dd. April 6, 2021, W21_159#21.174).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics Approval"}},{"value":"All participants provided written informed consent.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to Participate"}}]}}