7 Medication Groups That Can Affect Memory and Thinking
The claim that these medicines “cause severe dementia and profound brain damage” is too strong. Some medications can cause confusion, delirium, sedation, or memory problems, and certain exposures have been associated with cognitive decline. An association does not mean that a medication inevitably causes dementia or permanent brain damage. The American Geriatrics Society’s Beers Criteria identifies medications that may pose greater risks for older adults and emphasizes individualized clinical judgment. American Geriatrics Society+1
Seven groups that deserve particular attention include:
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Strong anticholinergic medications — These can interfere with acetylcholine, a neurotransmitter important for memory and cognition. The risk can be greater when several anticholinergic medicines are combined. American Geriatrics Society+1
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Benzodiazepines — Such as diazepam, lorazepam, and alprazolam. They can cause sedation, impaired memory, and delirium, particularly in older adults. National Institute on Aging
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Z-drug sleeping medications — Zolpidem and similar medicines can cause impaired alertness, confusion, and falls in some older adults. American Geriatrics Society
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First-generation antihistamines — Diphenhydramine and similar drugs have anticholinergic effects and can cause confusion or cognitive impairment. American Geriatrics Society
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Tricyclic antidepressants — Drugs such as amitriptyline can have substantial anticholinergic effects and may be problematic for some older adults. American Geriatrics Society
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Some bladder antimuscarinics — Certain medications used for overactive bladder can affect cognition, particularly in susceptible people. American Geriatrics Society
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Antipsychotic medications — These require particular caution in people who already have dementia because of serious risks, including increased mortality. They can nevertheless be appropriate for specific medical conditions when carefully prescribed. American Geriatrics Society
Don’t stop a medication suddenly
A medication on a caution list may still provide important benefits. Do not discontinue prescription medication on your own, particularly benzodiazepines, because abrupt withdrawal can be dangerous.
If an older adult develops new confusion, hallucinations, unusual sleepiness, or a sudden change in behavior, a clinician should review their medications—including over-the-counter drugs and supplements.
Bottom line: The useful question isn’t “Which seven drugs cause dementia?” but rather “Which of my medications could be affecting cognition, and are there safer alternatives?” A medication review with a doctor or pharmacist can answer that for an individual patient.
