• Noll Campbell, Malaz Boustani, Tony Limbil, Carol Ott, Chris Fox, Ian Maidment, Cathy C Schubert, Stephanie Munger, Donna Fick, David Miller, and Rajesh Gulati.
• Wishard Health Services, Indianapolis, IN, USA.
• Clin Interv Aging. 2009 Jan 1;4:225-33.

ContextThe cognitive side effects of medications with anticholinergic activity have been documented among older adults in a variety of clinical settings. However, there has been no systematic confirmation that acute or chronic prescribing of such medications lead to transient or permanent adverse cognitive outcomes.ObjectiveEvaluate the existing evidence regarding the effects of anticholinergic medications on cognition in older adults.Data SourcesWe searched the MEDLINE, OVID, and CINAHL databases from January, 1966 to January, 2008 for eligible studies.Study SelectionStudies were included if the anticholinergic activity was systematically measured and correlated with standard measurements of cognitive performance. Studies were excluded if they reported case studies, case series, editorials, and review articles.Data ExtractionWe extracted the method used to determine anticholinergic activity of medications and its association with cognitive outcomes.ResultsTwenty-seven studies met our inclusion criteria. Serum anticholinergic assay was the main method used to determine anticholinergic activity. All but two studies found an association between the anticholinergic activity of medications and either delirium, cognitive impairment or dementia.ConclusionsMedications with anticholinergic activity negatively affect the cognitive performance of older adults. Recognizing the anticholinergic activity of certain medications may represent a potential tool to improve cognition.

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