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Purpose: There is a need to balance the benefits and risks associated with strong anticholinergic medications in older adults, particularly among those with frailty and cognitive impairment. This study explored the international prevalence of strong anticholinergic medication use in residents of nursing homes with and without cognitive impairment and frailty., Methods: Secondary, cross-sectional analyses of data from 5,800 residents of 106 nursing homes in Australia, China, Czech Republic, England, Finland, France, Germany, Israel, Italy, Japan, Netherlands, and Spain were conducted. Strong anticholinergic medications were defined as medications with a score of 2 or 3 on the Anticholinergic Cognitive Burden scale. Dementia or cognitive impairment was defined as a documented diagnosis or using a validated scale. Frailty was defined using the FRAIL-NH scale as 0-2 (non-frail), 3-6 (frail) and 7-14 (most-frail). Data were analyzed using descriptive statistics., Results: Overall, 17.4 % (n = 1010) residents used ≥1 strong anticholinergic medication, ranging from 1.3 % (n = 2) in China to 27.1 % (n = 147) in Italy. The most prevalent strong anticholinergics were quetiapine (n = 290, 5.0 % of all residents), olanzapine (132, 2.3 %), carbamazepine (102, 1.8 %), paroxetine (88, 1.5 %) and amitriptyline (87, 1.5 %). Prevalence was higher among residents with cognitive impairment (n = 602, 17.9 %) compared to those without (n = 408, 16.8 %), and among residents who were most frail (n = 553, 17.9 %) compared to those who were frail (n = 286, 16.5 %) or non-frail (n = 171, 17.5 %)., Conclusions: One in six residents who were most frail and living with cognitive impairment used a strong anticholinergic. However, there was a 20-fold variation in prevalence across the 12 countries. Targeted deprescribing interventions may reduce potentially avoidable medication-harm., Competing Interests: Declaration of competing interest A.J.C. has received grant or consulting funds from the Medical Research Future Fund, Dementia Australia Research Foundation and the Pharmaceutical Society of Australia. All these funds were paid to the administering University. A.J.C. is also a national board director for the Pharmaceutical Society of Australia. S.H. belongs to an endowed chair funded by donations from Hakue technology, PROUMED, Japan Bio Products, Towa Pharmaceutical, Yellow Eight and Sugi Holdings and received research funding from SOMPO Care Inc. outside of this work. N.M.V. has received grant or consulting funds from UCB Biopharma, Nestlé and Vegenat. R.V. was previously on the board of Resthaven and the board governance committee. Visvanathan is co-founder and chair of the clinical advisory group for a wearable sensor technology start-up HealthVibes.ai. J.S.B. has received grant or consulting funds from the NHMRC, Medical Research Future Fund, Victorian Government Department of Health and Human Services, Dementia Australia Research Foundation, Yulgilbar Foundation, Aged Care Quality and Safety Commission, Australian Commission on Safety and Quality in Health Care, Dementia Centre for Research Collaboration, Pharmaceutical Society of Australia, Society of Hospital Pharmacists of Australia, GlaxoSmithKline Supported Studies Programme, Amgen, and several aged care provider organizations. All these funds were paid to the administering University. All other authors have no conflicts of interest to declare., (Copyright © 2024. Published by Elsevier B.V.)