7 Medications That Can Affect Memory and Cognition

The headline “7 medications that cause severe dementia and profound brain damage” is misleading. No commonly prescribed medication can accurately be described as inevitably causing severe dementia or permanent brain damage in everyone who takes it.

However, some medications can cause confusion, delirium, sedation, or cognitive impairment, particularly in older adults. Long-term or cumulative exposure to some drug classes has also been associated with increased dementia risk. The American Geriatrics Society specifically recommends caution with several of these medications in adults 65 and older. PubMed Central (PMC)+1

Examples include:

1. Diphenhydramine and other first-generation antihistamines
   These have strong anticholinergic effects and can cause confusion and delirium, particularly in older adults.

2. Amitriptyline and some other tricyclic antidepressants
   Their anticholinergic and sedating effects can impair cognition and increase fall risk.

3. Oxybutynin and some other bladder antimuscarinics
   These can contribute to anticholinergic cognitive effects; oxybutynin has particularly concerning evidence among this group. PubMed Central (PMC)

4. Benzodiazepines, such as diazepam, lorazepam, and alprazolam
   They can cause sedation and cognitive impairment and are associated with increased risks of delirium and falls in older adults. PubMed Central (PMC)

5. Z-drugs, such as zolpidem
   These sleep medications can cause confusion, impaired coordination, and other central nervous system effects, especially in older adults. PubMed Central (PMC)

6. Certain antipsychotic medications
   In people who already have dementia, chronic use can increase the risk of cognitive decline, stroke, and mortality. PubMed Central (PMC)

7. Other medications with strong anticholinergic effects
   Combining multiple anticholinergic medicines can increase the overall cognitive burden and risk of delirium. PubMed Central (PMC)

Don’t stop medication suddenly

Some of these drugs are appropriate and beneficial for particular medical conditions. Never discontinue a prescription medication on your own, particularly benzodiazepines, because abrupt withdrawal can itself be dangerous.

If an older adult develops new confusion, memory problems, excessive sleepiness, hallucinations, or major changes in behavior, ask their doctor or pharmacist to review all prescription medicines, over-the-counter drugs, and supplements.

The key issue is not simply whether a medication appears on a list—it’s the specific drug, dose, duration, combinations, and the person’s health and age.