7 Medications Linked to Cognitive Problems in Older Adults
There is an important distinction behind this headline: these medications do not simply “cause severe dementia and profound brain damage” in everyone who takes them. Some medicines can cause confusion, delirium, sedation, or cognitive impairment, and prolonged exposure to certain drug classes has been associated with increased dementia risk. The risk is particularly important in older adults, which is why medication reviews are recommended. PMC
1. Diphenhydramine
Diphenhydramine is a common first-generation antihistamine found in some allergy and nighttime cold medicines.
It has strong anticholinergic effects, which can cause drowsiness, confusion, urinary problems, and other effects that are more pronounced in older adults.
The 2023 American Geriatrics Society Beers Criteria recommends avoiding first-generation antihistamines such as diphenhydramine in older adults because cumulative anticholinergic exposure is associated with increased risks of delirium, falls, and dementia. PMC
2. Hydroxyzine
Hydroxyzine is another strongly anticholinergic antihistamine that may be used for itching, anxiety, or other conditions.
In older adults, its anticholinergic and sedating effects can contribute to confusion and impaired alertness.
The Beers Criteria lists hydroxyzine among first-generation antihistamines that should generally be avoided in older adults when safer alternatives are available. PMC
3. Amitriptyline
Amitriptyline is a tricyclic antidepressant that is also sometimes prescribed for certain types of nerve pain.
Although it can be effective for particular conditions, it has significant anticholinergic and sedating properties.
Older adults may be particularly susceptible to confusion, dizziness, constipation, urinary retention, and falls. The Beers Criteria identifies amitriptyline and other strongly anticholinergic tricyclic antidepressants as medications to avoid in many older adults. PMC
4. Oxybutynin
Oxybutynin is used to treat overactive bladder and urinary urgency.
It works by blocking acetylcholine, but that same anticholinergic activity can affect the brain.
The 2023 Beers Criteria specifically notes that oxybutynin has the best evidence for adverse cognitive effects among bladder antimuscarinic medications, while recommending caution with the entire class. PMC
If an older person develops new confusion or memory problems while taking a bladder medication, it is worth discussing the medication with their doctor or pharmacist.
5. Benzodiazepines
This group includes medications such as diazepam, lorazepam, alprazolam, clonazepam, and temazepam.
They can be useful for specific medical indications, but older adults are more sensitive to their effects and may metabolize some of these medicines more slowly.
Benzodiazepines can increase the risk of cognitive impairment, delirium, falls, and fractures. The Beers Criteria generally recommends avoiding them in older adults except when there is a specific appropriate indication. PMC
If someone has been taking a benzodiazepine regularly for a long time, they should not stop it suddenly, because withdrawal can be dangerous. A doctor can create a gradual taper when appropriate.
6. Zolpidem and Other “Z-Drugs”
Zolpidem, along with medications such as zaleplon and eszopiclone, is used for insomnia.
Although these drugs aren’t technically benzodiazepines, they act on similar brain receptors and can cause sedation, impaired coordination, confusion, and falls.
The Beers Criteria recommends avoiding these medications in many older adults because their benefits for sleep are relatively limited while their risks—including cognitive and fall-related problems—can be significant. PMC
7. Certain Antipsychotic Medications
Antipsychotics such as olanzapine, risperidone, quetiapine, and haloperidol have important uses for particular psychiatric and neurological conditions.
However, their use in older adults with dementia requires special caution.
The Beers Criteria states that antipsychotic medications are associated with an increased risk of stroke and higher mortality in people with dementia, and they should generally not be used for behavioral symptoms of dementia unless non-drug approaches have failed or aren’t possible and the person poses a substantial risk of harm. PMC
This does not mean everyone taking an antipsychotic will develop dementia or brain damage. In some situations, these medicines may be medically necessary.
Why Medication Reviews Matter
The greatest concern is often not one isolated medication but the total medication burden.
Taking multiple medicines with anticholinergic or sedating effects can increase the risk of cognitive problems, delirium, and falls. The 2023 Beers Criteria specifically recommends minimizing combinations of medications with strong anticholinergic effects. PMC
Older adults should therefore periodically ask their doctor or pharmacist to review:
- Prescription medications
- Over-the-counter sleep aids
- Allergy medicines
- Pain medications
- Bladder medications
- Anxiety medications
- Supplements and herbal products
Don’t Stop a Medication on Your Own
If you recognize one of these medications on your list, don’t panic and don’t abruptly stop it.
A medication may have been prescribed for a legitimate reason, and suddenly discontinuing certain drugs—particularly benzodiazepines—can cause serious withdrawal symptoms.
Instead, ask your doctor or pharmacist whether the medication is still necessary, whether the dose is appropriate, and whether a safer alternative is available.
Final Takeaway
The evidence does not support the claim that seven medications universally cause “severe dementia and profound brain damage.” A more accurate message is that anticholinergic drugs, benzodiazepines, Z-drugs, and certain antipsychotics can cause cognitive problems or other serious risks in older adults, and some long-term exposures are associated with increased dementia risk. PMC
For an older adult taking several medications, a professional medication review can be one of the most useful steps for identifying unnecessary drugs, potentially risky combinations, and safer alternatives.
