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The aim was to assess the impact of the early COVID\u201019 pandemic on mental health\u2010related care.<\/jats:p><\/jats:sec>Methods<\/jats:title>We used national registries in Norway and Sweden (1 January 2018\u201331 December 2020) to define 2 cohorts: (i) general adult population; and (ii) mental health adult population. Interrupted times series regression analyses evaluated step and slope changes compared to prepandemic levels for monthly rates of medications (antidepressants, antipsychotics, anxiolytics, hypnotics\/sedatives, lithium, opioid analgesics, psychostimulants), hospitalizations (for anxiety, bipolar, depressive\/mood, eating and schizophrenia\/delusional disorders) and specialist outpatient visits.<\/jats:p><\/jats:sec>Results<\/jats:title>In Norway, immediate reductions occurred in the general population for medications (\u221212% antidepressants to \u22127% hypnotics\/sedatives) except for antipsychotics; and hospitalizations (\u221233% anxiety disorders to \u221217% bipolar disorders). Increasing slope change occurred for all medications except psychostimulants (+1.1%\/month hypnotics\/sedatives to +1.7%\/month antidepressants); and hospitalization for anxiety disorders (+5.5%\/month), depressive\/mood disorders (+1.7%\/month) and schizophrenia\/delusional disorders (+2%\/month). In Sweden, immediate reductions occurred for antidepressants (\u22127%) and opioids (\u221210%) and depressive\/mood disorder hospitalizations (\u221211%) only with increasing slope change in psychostimulant prescribing of (0.9%\/month). In contrast to Norway, increasing slope changes occurred in specialist outpatient visits for depressive\/mood disorders, eating disorders and schizophrenia\/delusional disorders (+1.5, +1.9 and +2.3%\/month, respectively). Similar changes occurred in the pre\u2010existing mental health cohorts.<\/jats:p><\/jats:sec>Conclusion<\/jats:title>Differences in early COVID\u201019 policy response may have contributed to differences in adult mental healthcare provision in Norway and Sweden.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bcp.16044","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T23:36:05Z","timestamp":1711928165000},"page":"1627-1636","source":"Crossref","is-referenced-by-count":6,"title":["Impact of the early COVID\u201019 pandemic on adult mental health\u2010related dispensed medications, hospitalizations and specialist outpatient visits in Norway and Sweden: Interrupted time series analysis"],"prefix":"10.1111","volume":"90","author":[{"given":"David","family":"Moreno\u2010Martos","sequence":"first","affiliation":[{"name":"Division of Population Health and Genomics University of Dundee Dundee 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