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At standard doses used for schizophrenia or bipolar disorder, quetiapine has been associated with weight gain and increased levels of triglycerides, total cholesterol and low‐density lipoprotein (LDL) cholesterol, which are risk factors for cardiovascular morbidity and mortality. However, this drug is also commonly used off‐label at low doses for anxiolytic or hypnotic purposes, and its cardiovascular safety at these doses is unknown. We aimed to assess the risk of major adverse cardiovascular events with use of low‐dose quetiapine compared to use of Z‐drug hypnotics in a nationwide, active comparator‐controlled cohort study. The cohort included new users of either drugs in Denmark from 2003 to 2017, aged 18‐85 years, without history of ischemic stroke, myocardial infarction, cancer, and severe mental illness. The main outcome was the occurrence of major adverse cardiovascular events, defined as non‐fatal …