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Adverse Drug Reactions Associated with Global Cognitive Impairment in Elderly Persons

[+] Article and Author Information

Grant support: in part by grants 5-R01-MH33841, AG05136, AG06781, and P 50MH40014 from National Institute of Aging and National Institute of Mental Health. Dr. Larson was a Henry J. Kaiser Family Foundation Teaching and Research Scholar in General Internal Medicine.

▸Requests for reprints should be addressed to Eric B. Larson, M.D., Department of Medicine, RG-20, University of Washington; Seattle, WA 98195.

©1987 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1987;107(2):169-173. doi:10.7326/0003-4819-107-2-169
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Adverse drug reactions causing cognitive impairment are an important problem in the elderly. Thirty-five patients with adverse drug reaction were identified among more than 300 patients evaluated for cognitive impairment and compared with patients without adverse drug reaction. Sedative hypnotic agents, especially long-acting benzodiazepines, were the commonest drugs associated with cognitive impairment in this population. The number of drugs used, use of sedative hypnotics and antihypertensives, and falling were strongly associated with adverse reactions in logistic regression analyses. The relative odds of an adverse reaction associated with cognitive impairment increased as the number of prescription drugs increased, exceeding 9.0 for patients taking four or more prescription drugs. Adverse drug reactions are an important source of excess morbidity in patients with dementia or suspected dementia. Strategies that could minimize this problem include a high index of suspicion, drug-free trials in suspected cases, and careful monitoring of drug therapy.





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