7 Medications That May Harm Memory and Brain Function—Especially With Long-Term Use
As we get older, medications become an increasingly important part of everyday life. A person may take one medicine for blood pressure, another for pain, another for sleep, and perhaps several more for bladder problems, allergies, anxiety, or depression.
Most medications are prescribed because their benefits outweigh their risks. But some medicines can affect the brain, particularly in older adults. They may cause drowsiness, confusion, memory problems, delirium, impaired attention, falls, or other changes in thinking. Some classes have also been associated with a higher risk of dementia when used for long periods. National Institute on Aging+1
This does not mean you should stop taking a prescribed medicine.
In fact, suddenly stopping certain medications can itself be dangerous. The safest approach is to have your medications reviewed by a doctor or pharmacist, particularly if you have noticed new memory or thinking problems.
Here are seven medication groups worth knowing about.
1. Strong Anticholinergic Medications
Anticholinergic drugs are among the most important medications to discuss when talking about memory and aging.
These medicines interfere with the action of acetylcholine, a chemical messenger involved in memory, attention, and other brain functions.
Some anticholinergic medicines are used for bladder problems, depression, Parkinson’s disease, allergies, nausea, and other conditions.
Examples include certain drugs such as:
- Amitriptyline
- Paroxetine
- Oxybutynin
- Tolterodine
- Solifenacin
- Procyclidine
Research has found an association between prolonged exposure to some strong anticholinergic medicines and increased dementia risk. One large study involving people over 65 found that certain anticholinergic drugs used for depression, bladder conditions, and Parkinson’s disease were associated with increased dementia risk. Alzheimer’s Society+1
But there is an important distinction: an association does not prove that the medication directly caused dementia in every person who took it.
Some people may already have underlying health conditions that increase dementia risk, which can complicate the research.
These medications can also cause more immediate effects, such as confusion, dry mouth, constipation, blurred vision, and difficulty concentrating.
If you’re taking several medications with anticholinergic effects, ask your doctor or pharmacist whether the total burden could be affecting your thinking.
2. Benzodiazepines
Benzodiazepines are medications commonly prescribed for anxiety, insomnia, seizures, and certain other conditions.
Examples include medications such as diazepam, lorazepam, clonazepam, and alprazolam.
These drugs can be particularly concerning in older adults because they can cause drowsiness, impaired coordination, memory problems, delirium, falls, and fractures. The National Institute on Aging specifically warns that benzodiazepines may increase older adults’ risk of memory loss, delirium, cognitive impairment, falls, and fractures. National Institute on Aging
Long-term use also requires careful medical supervision.
That doesn’t mean someone who takes a benzodiazepine will develop dementia. The evidence surrounding long-term benzodiazepine exposure and dementia risk is complicated, and researchers continue to study the relationship.
The practical lesson is simpler: if an older adult has been taking one for a long time, it is worth periodically reviewing whether it is still necessary.
Do not suddenly stop a benzodiazepine. Depending on the medication and duration of use, withdrawal can be serious. A doctor may recommend a gradual taper when discontinuation is appropriate.
3. Certain Antipsychotic Medications
Antipsychotic medications are sometimes prescribed to people experiencing severe psychiatric symptoms or certain difficult behavioral symptoms associated with dementia.
Examples include risperidone, quetiapine, olanzapine, and haloperidol.
These medicines don’t necessarily cause dementia, but they can have significant effects on older adults, particularly people who already have dementia.
Potential problems include:
- Drowsiness
- Confusion
- Reduced mobility
- Falls
- Stroke
- Worsening cognitive symptoms
- Increased risk of death in certain people with dementia
The Alzheimer’s Society notes that antipsychotics can worsen thinking and memory and increase risks such as falls, stroke, and earlier death in people with dementia. Alzheimer’s Society
Because of these risks, they should generally be used carefully and for appropriate indications.
If someone taking an antipsychotic becomes unusually sleepy, confused, unsteady, or noticeably different, the prescribing clinician should be informed.
4. Some Medications Used for Bladder Problems
Overactive bladder and urinary incontinence are common, particularly among older adults.
Some medications used to treat these conditions have anticholinergic effects.
Examples include oxybutynin, tolterodine, and solifenacin.
These drugs can be helpful for some people, but anticholinergic effects may become more problematic with age.
Research has raised concerns about long-term exposure to certain bladder anticholinergics and dementia risk. Alzheimer’s Society+1
If you are taking one of these medications and have developed new problems with memory, concentration, or confusion, don’t simply discontinue it.
Ask whether there are alternative treatments or whether your medication regimen can be adjusted.
This is especially important when a person is taking multiple medications that have anticholinergic effects because their effects can add together.
5. Some Older Antidepressants
Not all antidepressants are associated with the same cognitive concerns.
Certain older antidepressants, particularly those with strong anticholinergic properties, deserve special consideration in older adults.
Amitriptyline, dosulepin, and paroxetine are examples that have been identified in research concerning anticholinergic exposure and dementia risk. Alzheimer’s Society
This does not mean antidepressants should be avoided.
Depression itself can seriously affect concentration, motivation, memory, sleep, and quality of life. Treating depression can therefore be extremely important.
The question is whether the specific medication remains the best choice for the individual.
If an older adult has been taking an antidepressant for years, a periodic medication review can determine whether the benefits continue to outweigh potential risks.
6. Sedating Medications Used for Sleep
Sleep problems become increasingly common with age, and many people turn to medications or over-the-counter products to help them sleep.
Some sedating medicines can cause next-day drowsiness, impaired attention, balance problems, and confusion.
This can be particularly dangerous in older adults because impaired alertness can increase the risk of falls and injuries.
Some over-the-counter sleep and allergy products also contain medications with anticholinergic effects, which can contribute to confusion and memory difficulties.
The National Institute on Aging specifically emphasizes the cognitive and safety risks associated with certain medications in older adults. National Institute on Aging
If you’re regularly taking a sleep aid, don’t assume that an over-the-counter product is automatically harmless simply because you don’t need a prescription to purchase it.
Tell your doctor or pharmacist about everything you take—including nonprescription medicines and supplements.
7. Some Medications Can Cause Delirium Without Causing Dementia
This distinction is extremely important.
A medication can cause acute confusion or delirium without actually causing permanent dementia.
Delirium can develop quickly, sometimes over hours or days. A person may suddenly become confused, unusually sleepy, agitated, disoriented, or unable to concentrate.
Many things can trigger delirium, including medications, infections, dehydration, pain, metabolic problems, and hospitalization.
An older person who suddenly becomes confused should not automatically be assumed to have developed dementia.
Sudden confusion deserves medical evaluation because the underlying cause may be treatable.
In other words, confusion from a medication and progressive dementia are not the same thing.
The Biggest Warning Sign: A Sudden Change
If an older adult has been thinking clearly and suddenly becomes confused after starting a new medication or changing a dose, don’t simply assume it is “old age.”
Pay attention to when the symptoms began.
Ask:
- Was a new medication recently started?
- Was the dose increased?
- Was another medicine added?
- Did the person start taking an over-the-counter sleep or allergy product?
- Are several medications being taken that can affect the brain?
- Has the person become unusually sleepy or unsteady?
- Is the confusion sudden rather than gradually progressive?
These details can help a healthcare professional determine whether medication may be contributing.
Never Stop Important Medication Without Medical Advice
This may be the most important message in the entire article.
If you recognize a medication on this list, don’t panic and don’t stop taking it on your own.
Some medications need to be reduced gradually. Abruptly stopping certain drugs can cause withdrawal symptoms, rebound symptoms, seizures, dangerously high blood pressure, or other complications.
Instead, make a list of every medication you take and ask your doctor or pharmacist for a medication review.
Include:
- Prescription medicines
- Over-the-counter medicines
- Sleep aids
- Allergy medicines
- Pain medicines
- Vitamins
- Herbal supplements
Sometimes the solution isn’t eliminating a medication. It may simply involve lowering the dose, changing the timing, replacing one drug with another, or eliminating an unnecessary medication.
The Bottom Line
The claim that “seven medications cause severe dementia and profound brain damage” is too absolute.
The reality is more nuanced.
Certain medications—particularly strong anticholinergic drugs and benzodiazepines—can impair memory and thinking, and prolonged exposure to some medications has been associated with increased dementia risk. Other drugs, including certain antipsychotics, can cause significant confusion, sedation, falls, stroke, or other serious complications in vulnerable older adults. Alzheimer’s Society+2
But these medications can also be appropriate and beneficial when properly prescribed.
The goal isn’t to frighten people away from necessary treatment.
The goal is to encourage regular medication reviews, especially as we get older.
If you or a loved one has developed new memory problems, unusual sleepiness, confusion, dizziness, or changes in behavior after starting or changing a medication, tell your doctor or pharmacist.
Sometimes what looks like “normal aging” isn’t aging at all—it may be a medication effect that can be identified and addressed.
