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High Dose and Extended Use of Anticholinergic Drugs May Increase Risk for Dementia, Study Suggests
Previous studies have suggested that medicines—both prescription and over-the-counter—aiming to block the actions of acetylcholine may be associated with increased risk for cognitive impairment, but a new
published this week in
JAMA Internal Medicine
shows that use of such medicines in older adults may increase risk for dementia.
Researchers from the Geriatric Pharmacy Program at the University of Washington led a study with over 3,400 participants, aged 65 years and older and no history of dementia at the study's initiation, to examine whether a correlation existed between cumulative anticholinergic drug use and the onset of dementia. Pharmacy-dispensing data were analyzed over a 10-year period to ascertain patients’ cumulative anticholinergic exposure.
The results showed that individuals taking daily dosages of at least 10 mgs of tricyclic antidepressants such as doxepin, 4 mgs of first-generation antihistamines such as chlorpheniramine, or 5 mgs of antimuscarinics for bladder control such as oxybutynin for more than three years were at greater risk for developing dementia than their counterparts who did not use such medicines long term.
The researchers noted that the study highlights the need to increase awareness among health care professionals and older adults about the potential risk associated with extended use of anticholinergic drugs, as well as a need for efforts to minimize such drug use. "Older adults should be aware that many medications—including some available without a prescription,...
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