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Given this response and existence of side effects, we sought to quantify medication use and benefits in a population\u2010based study of incident AD cases.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The Cache County Dementia Progression Study enrolled and followed a cohort of 327 incident AD cases for a maximum of 9 years. Drug exposure was expressed using a persistency index (PI), calculated as total years of drug use divided by total years of observation. Linear mixed\u2010effects models examined PI, and interactions with sex and apolipoprotein E (<jats:italic>APOE<\/jats:italic>) as predictors of clinical progression on the Mini\u2010Mental State Examination and Clinical Dementia Rating\u2010Sum of Boxes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 69 participants (21.1%) reported having ever used cholinesterase inhibitors or memantine. There was a strong three\u2010way interaction between PI, sex, and time. Among women, a higher PI (i.e., greater duration of use) of cholinesterase inhibitors was associated with slower progression on the Mini\u2010Mental State Examination and Clinical Dementia Rating\u2010Sum of Boxes, particularly among those with an <jats:italic>APOE<\/jats:italic> \u03b54 allele. In contrast, higher PI was associated with faster progression in males.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>A low percentage of individuals with AD in the community are taking cholinesterase inhibitors or memantine. This study suggests that women, particularly those with an <jats:italic>APOE<\/jats:italic> \u03b54 allele, may benefit the most from these medications. With the newly approved increased dose of donepezil, it will be imperative to determine whether a higher dose is needed in men or whether other factors warrant consideration.<\/jats:p><\/jats:sec>","DOI":"10.1016\/j.jalz.2011.02.011","type":"journal-article","created":{"date-parts":[[2012,2,1]],"date-time":"2012-02-01T17:58:20Z","timestamp":1328119100000},"page":"180-187","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Effects of Food and Drug Administration\u2010approved medications for Alzheimer's disease on clinical progression"],"prefix":"10.1002","volume":"8","author":[{"given":"Michelle M.","family":"Mielke","sequence":"first","affiliation":[{"name":"Department of Psychiatry Division of Geriatric Psychiatry and Neuropsychiatry Johns Hopkins University School of Medicine Baltimore MD 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