8 Medications That May Be Linked to a Higher Risk of Dementia
As people age, it’s common to take one or more medications to manage chronic health conditions. While many prescription and over-the-counter medicines are both safe and effective when used as directed, researchers continue to study whether certain medications may be associated with an increased risk of cognitive decline or dementia, particularly with long-term use.
It’s important to understand that an association does not necessarily mean a medication causes dementia. In many cases, the underlying medical condition, age, overall health, or other factors may also influence the risk. For this reason, you should never stop taking a prescribed medication without first consulting your healthcare provider.
This article explores eight categories of medications that have been investigated for possible links to dementia and explains what current research suggests.
What Is Dementia?
Dementia is a general term for a decline in memory, thinking, reasoning, and the ability to perform everyday activities. It is not a normal part of aging, although age is the greatest known risk factor.
Common symptoms may include:
- Memory loss
- Difficulty concentrating
- Confusion
- Problems with communication
- Difficulty completing familiar tasks
- Changes in mood or behavior
While some causes of cognitive impairment are reversible, others, such as Alzheimer’s disease, are progressive.
1. Anticholinergic Medications
Anticholinergic drugs are among the most studied medication groups in dementia research. These medicines block the action of acetylcholine, a chemical messenger involved in memory, learning, and muscle function.
They are commonly found in medications used to treat:
- Allergies
- Overactive bladder
- Motion sickness
- Parkinson’s disease
- Some digestive disorders
Research suggests that long-term use of strong anticholinergic medications, particularly in older adults, may be associated with a higher risk of cognitive decline.
If you’re taking one of these medications regularly, ask your healthcare provider whether lower-risk alternatives are available.
2. Certain Sleep Medications
Prescription medications used to treat insomnia can be very helpful for short-term sleep problems, but some have been linked to confusion, falls, and memory issues, especially in older adults.
Some studies have explored whether long-term use of certain sleep medications may be associated with an increased risk of dementia. However, the evidence is mixed, and researchers are still working to understand whether the medications, the sleep disorder itself, or other health factors explain the association.
Good sleep hygiene and non-drug approaches may be appropriate for some people, depending on the cause of insomnia.
3. Benzodiazepines
Benzodiazepines are commonly prescribed for anxiety, panic disorders, muscle spasms, and seizures.
These medications may cause side effects such as:
- Drowsiness
- Slowed thinking
- Poor coordination
- Short-term memory problems
Several studies have examined whether long-term benzodiazepine use is associated with a higher risk of dementia. While some research suggests a possible link, other studies have found no clear causal relationship.
Healthcare providers often recommend using these medications at the lowest effective dose and for the shortest appropriate duration.
4. Some Medications for Overactive Bladder
Many medications used to treat overactive bladder have anticholinergic effects.
Because acetylcholine plays an important role in memory and learning, prolonged exposure to medications with strong anticholinergic properties has raised concerns among researchers.
Not all bladder medications carry the same level of risk. Newer treatment options may have less effect on brain function for some patients.
Discuss your treatment options with your healthcare provider if you have concerns.
5. Certain Antidepressants
Antidepressants help millions of people manage depression and anxiety, and they can significantly improve quality of life.
Some older antidepressants—particularly those with strong anticholinergic effects—have been investigated for possible links to cognitive decline.
However, many newer antidepressants have much lower anticholinergic activity, and untreated depression itself can affect memory and thinking.
Your healthcare provider can help determine which medication best fits your individual needs.
6. Some Medications for Parkinson’s Disease
Certain medications used to treat Parkinson’s disease may influence brain chemicals involved in thinking and memory.
In some individuals, these medications may contribute to temporary confusion or hallucinations, particularly at higher doses or in older adults.
Because Parkinson’s disease itself can increase the risk of cognitive impairment, it can be difficult for researchers to separate the effects of the disease from the effects of medication.
Treatment decisions should always balance symptom control with potential side effects.
7. Certain Older Antihistamines
Some first-generation antihistamines, commonly used for allergies or cold symptoms, have strong anticholinergic properties.
These medications may cause:
- Drowsiness
- Confusion
- Dry mouth
- Blurred vision
- Memory difficulties
Occasional use is different from long-term, frequent use. If you regularly need allergy medication, ask your healthcare provider whether a newer, less sedating option may be appropriate.
8. Multiple Medications (Polypharmacy)
Sometimes, the issue isn’t a single medication but taking several medications at the same time.
Polypharmacy—often defined as the regular use of five or more medications—can increase the likelihood of:
- Drug interactions
- Side effects
- Confusion
- Falls
- Cognitive changes
Older adults are particularly vulnerable because the body processes medications differently with age.
Regular medication reviews with a healthcare provider or pharmacist can help identify medicines that may no longer be necessary or that could be adjusted.
Who May Be More Vulnerable?
Some people may be more sensitive to medication-related cognitive side effects, including:
- Adults over age 65
- People taking multiple medications
- Individuals with kidney or liver disease
- Those with a history of stroke
- People with existing memory problems
- Individuals with certain neurological conditions
This doesn’t mean these medications should be avoided altogether—it means they should be used thoughtfully and monitored appropriately.
Tips to Help Protect Brain Health
If you’re concerned about memory or medication use, these strategies may help:
- Take medications exactly as prescribed.
- Never stop a medication without medical advice.
- Keep an up-to-date list of all prescription and over-the-counter medicines and supplements.
- Ask your healthcare provider or pharmacist to review your medications regularly.
- Stay physically active.
- Eat a balanced diet rich in fruits, vegetables, whole grains, and healthy fats.
- Get enough quality sleep.
- Stay socially and mentally engaged.
- Manage conditions such as high blood pressure, diabetes, and high cholesterol.
Healthy lifestyle habits play an important role in supporting long-term brain health.
Frequently Asked Questions
Do these medications cause dementia?
Current research generally shows associations rather than proof of cause and effect. In many cases, the medical condition being treated, age, and other health factors may also contribute to dementia risk.
Should I stop taking my medication if I read about these risks?
No. Never stop or change a prescribed medication without first speaking with your healthcare provider. Stopping some medications suddenly can be harmful.
Are all anticholinergic medications equally risky?
No. Anticholinergic medications vary in strength, and some have a greater effect on the brain than others. Your healthcare provider can help determine whether an alternative is appropriate for you.
Can medication-related memory problems improve?
In some cases, cognitive side effects caused by medications may improve after a healthcare provider adjusts the treatment plan. However, this depends on the individual, the medication involved, and the underlying cause of the symptoms.
Final Thoughts
Many medications provide important health benefits, and for most people, the benefits outweigh the potential risks. However, researchers continue to investigate how certain drugs—particularly those with strong anticholinergic effects or those used long term—may influence brain health as people age.
The best approach is not to avoid medication out of fear but to use it wisely. Regular medication reviews, open communication with your healthcare provider, and healthy lifestyle habits can help support both your overall health and cognitive well-being.
If you or a loved one has noticed new memory problems, confusion, or changes in thinking, don’t assume they’re simply part of aging. Seeking medical advice can help identify the cause and determine the most appropriate next steps.