Does Xanax cause dementia? The honest answer is that no study has shown it does, but some large studies have found that long-term use of benzodiazepines is linked to a higher risk of developing Alzheimer’s disease, and others have found no link at all. What is not in doubt is that Xanax affects memory and thinking while you take it, that it can cause confusion, that the effect is stronger in older adults, and that some cognitive problems can outlast the prescription. This chapter walks through what the research found, why the studies disagree, and what that means for anyone taking Xanax or other benzodiazepines, or considering benzo addiction treatment in Minnesota because the drug has become hard to stop.
How Xanax and Other Benzodiazepines Affect the Brain and Memory
Xanax (alprazolam) and other benzodiazepines make gamma-aminobutyric acid, the brain chemical that slows the activity of neurons, more potent [4]. That is how they treat anxiety and insomnia, and it is also why they affect memory: the same calming chemical signal that quiets worry also dampens the brain circuits that record new information, especially at higher doses and in older brains. How the drug class works more broadly is covered in the guide to what benzodiazepines are and how they work.
While Xanax is active, it can interfere with the formation of new memories and can slow attention and thinking. In the clinical trials listed on the Xanax label, memory impairment was reported in about one-third of people taking alprazolam for panic disorder, and confusion is also a recognized adverse effect [9]. Acute cognitive effects often improve as the medication clears, but cognitive problems associated with longer-term benzodiazepine use may take longer to resolve and do not always disappear immediately after treatment ends. The question behind “does Xanax cause dementia” is different: whether long-term exposure actually causes a progressive disease such as Alzheimer’s disease or another dementia. Other shorter-term effects on mood and behavior are covered in does Xanax make you angry.
What the Research Shows
Researchers have studied benzodiazepines and dementia for more than a decade, and the research points in two directions. Most studies look at people who were prescribed these medications for anxiety, sleep, or pain and then follow who is later diagnosed with dementia.
One influential study published in the BMJ in 2014 used Quebec health insurance records to compare 1,796 people age 66 or older who had Alzheimer’s disease with 7,184 controls [1]. Previous benzodiazepine exposure was associated with 51 percent higher odds of Alzheimer’s disease overall. The association was not significant among people with up to 90 cumulative prescribed daily doses, but the odds were 32 percent higher with 91 to 180 prescribed daily doses and 84 percent higher with more than 180 [1]. Those categories roughly corresponded to up to three months, three to six months, and more than six months of cumulative exposure, but they did not necessarily represent uninterrupted daily use.
The association was also stronger for long-acting benzodiazepines than for short-acting medications [1]. The authors emphasized that the study could not establish whether benzodiazepines caused Alzheimer’s disease or were being prescribed for symptoms that appeared during the disease’s long prodromal stage. Differences in how long benzodiazepines remain active are explained further in the chapter on the longest-lasting benzodiazepine.
Studies Pointing to Chronic Conditions Instead
A 2022 study from the USC Schaeffer Center identified the opposite result. Published in Alzheimer’s & Dementia, it used Medicare records from 2006 to 2020 for people 67 and older and found little evidence that benzodiazepines increase dementia risk or the risk of developing dementia later [2]. The researchers noted that people prescribed benzodiazepines had much higher rates of depression, anxiety, insomnia, and other chronic conditions such as high blood pressure, diabetes, and stroke. Once those conditions were accounted for, the association shrank to little or nothing. Among people prescribed benzodiazepines only for pain conditions, there was little difference in dementia onset [2].
Why the Studies Disagree
The central problem is timing. Anxiety and disrupted sleep are common early symptoms of Alzheimer’s disease, sometimes years before a dementia diagnosis [3]. Someone in the earliest stage of the disease, not yet diagnosed, may be prescribed a benzodiazepine for those symptoms, which makes the drug look like a cause when it may be an early signal. The BMJ authors themselves said the drugs could be a marker of the disease rather than its cause, and a Harvard physician commenting on the study cautioned that “we still can’t say that benzodiazepines actually cause Alzheimer’s” [1][3]. The possibility has not been ruled out either way, which is why most doctors now approach long-term benzodiazepine use in older people with caution regardless.
What Is Clear: Short-Term and Long-Term Risks for Older People
Whatever the dementia answer turns out to be, older adults face well-established risks from benzodiazepines because aging changes both how the body handles these medications and how sensitive the brain is to them. Older adults generally have greater sensitivity to benzodiazepine effects, and the metabolism or elimination of some drugs in the class can slow with age. Increased body fat can also prolong the elimination of highly lipophilic, long-acting benzodiazepines such as diazepam, allowing them and their active metabolites to accumulate with repeated use.
These effects vary considerably from one benzodiazepine to another, so they should not be assumed to apply equally to Xanax, Ativan, Valium, and every other drug in the class. Drug duration and detection are explained further in how long do benzodiazepines stay in your system.
The American Geriatrics Society’s Beers Criteria list benzodiazepines as potentially inappropriate for older adults because of heightened sensitivity and reduced clearance, citing an increased risk of cognitive impairment and falls [6]. A review in American Family Physician found that benzodiazepines raise the risk of hip fracture in older adults by at least 50 percent [5]. Even the USC researchers, who found no dementia link, noted decades of evidence of injuries from disorientation, balance problems, and daytime drowsiness [2]. Whether any drug in the class is a safer choice for an older person is covered in the chapter on the safest benzodiazepine.
Does the Type of Benzodiazepine Matter?
It may matter for some effects, but the dementia evidence is not settled. In the 2014 Quebec study, the association with Alzheimer’s disease was stronger for long-acting benzodiazepines than for short-acting medications [1]. Long-acting drugs such as diazepam can accumulate more during repeated dosing and may take longer to leave the body, particularly in older adults.
That does not mean short-acting drugs such as Xanax or Ativan are safe for older people. The 2023 Beers Criteria specifically notes that shorter-acting benzodiazepines are not safer than long-acting ones when it comes to falls, and all benzodiazepines can cause cognitive impairment, physical dependence, and other adverse effects in older adults. The unresolved dementia question is another reason to use these medications only when their expected benefits outweigh their risks.
Does Memory Improve After Stopping Xanax?
For many people, yes, but not always quickly. The same American Family Physician review described a meta-analysis in which long-term use led to substantial cognitive decline that had not resolved three months after people stopped [5]. Memory problems that persist after stopping should be evaluated by doctors, since they can have other causes, including depression, sleep disorders, and early dementia itself.
The worst thing to do with that concern is to stop suddenly. It is not safe to quit benzodiazepines cold turkey [4][7], because withdrawal symptoms can include seizures, for the reasons laid out in why benzodiazepine withdrawal can become a medical emergency. The right path is a taper planned with a prescriber, with the pace set by how the person responds.
Should Older Adults Avoid Benzodiazepines? Safer Options for Anxiety
For long-term anxiety, the medications with the best track record are not benzodiazepines, and for older people the Beers Criteria flag benzodiazepines as potentially inappropriate [6]. SSRI and SNRI antidepressants can help treat generalized anxiety; buspirone is a non-sedating anti-anxiety medication with less potential to be addictive; and cognitive behavioral therapy is the best-supported psychotherapy [8]. Harvard Health also advises caution with a second class of drugs, anticholinergics (some sleep aids, bladder medications, and older antidepressants), which have been linked to dementia risk in their own studies [4]. Non-drug approaches are weighed in non-benzodiazepine options for anxiety.
Frequently Asked Questions About Xanax and Dementia
Is There a Link Between Xanax and Alzheimer’s?
There is an association in some studies, not proof of cause. A 2014 study from Canada found higher Alzheimer’s risk with more than three months of benzodiazepine use [1], while a 2022 Medicare study found no increase once other chronic conditions were considered [2]. Anxiety and insomnia can be early symptoms of the disease itself.
Should People With Dementia Take Xanax?
Only with great care. The Beers Criteria advise that older adults avoid benzodiazepines where possible because of confusion and fall risk [6], and people with dementia are especially sensitive. Stopping should be a doctor-led taper, like the one in how a supervised lorazepam taper works.
Does Xanax Cause Cognitive Decline?
It causes short-term memory and thinking problems while it is active, and long-term use has been linked to cognitive decline that can persist for months after stopping [5]. Whether that decline progresses to developing dementia is the unresolved question.
Getting Help if Xanax Has Become Hard to Stop
If you or a parent has been taking benzodiazepines for months or years and the memory question has you worried, the next step is a conversation with the prescriber about the potential risks and a gradual plan. For many people, the harder part is the dependence, or addiction, itself. Northwoods Haven’s intensive outpatient program coordinates tapers with prescribers and treats the anxiety and sleep problems underneath, on a schedule built around work and family. Reach out for a confidential conversation.
Sources
- Billioti de Gage S, et al., “Benzodiazepine use and risk of Alzheimer’s disease: case-control study,” BMJ, 2014;349:g5205. https://www.bmj.com/content/349/bmj.g5205
- USC Schaeffer Center, “Benzodiazepines Don’t Increase Dementia Risks in Older Adults, USC Study Finds,” July 20, 2022, reporting Joyce G, Zissimopoulos J, et al., Alzheimer’s & Dementia. https://schaeffer.usc.edu/research/benzodiazepines-dont-increase-dementia-risks-in-older-adults-usc-study-finds
- Merz B, “Benzodiazepine use may raise risk of Alzheimer’s disease,” Harvard Health Blog, September 10, 2014. https://www.health.harvard.edu/blog/benzodiazepine-use-may-raise-risk-alzheimers-disease-201409107397
- Harvard Health Publishing, “Two types of drugs you may want to avoid for the sake of your brain,” updated March 2, 2021. https://www.health.harvard.edu/mind-and-mood/two-types-of-drugs-you-may-want-to-avoid-for-the-sake-of-your-brain
- Johnson B, Streltzer J, “Risks Associated with Long-Term Benzodiazepine Use,” American Family Physician, August 15, 2013;88(4):224-226. https://www.aafp.org/afp/2013/0815/p224
- Bounds CG, Patel P, “Benzodiazepines,” StatPearls, National Library of Medicine, last updated January 30, 2024. https://www.ncbi.nlm.nih.gov/books/NBK470159/
- U.S. Food and Drug Administration, “FDA requiring Boxed Warning updated to improve safe use of benzodiazepine drug class,” Drug Safety Communication, September 23, 2020. https://www.fda.gov/drugs/drug-safety-and-availability/fda-requiring-boxed-warning-updated-improve-safe-use-benzodiazepine-drug-class
- National Institute of Mental Health, “Generalized Anxiety Disorder: When Worry Gets Out of Control,” revised 2025. https://www.nimh.nih.gov/health/publications/generalized-anxiety-disorder-gad
- U.S. Food and Drug Administration, “XANAX (alprazolam) tablets, prescribing information,” revised January 2023. https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/018276s059lbl.pdf
