# 🚨 Alert: 8 Types of Medicines That May Affect Memory and Cognition The headline “8 drugs that cause serious dementia” is misleading. No responsible medical source can say that eight specific medicines simply _cause_ dementia. However, some medications—particularly those with anticholinergic or sedating effects—can cause confusion and cognitive problems and have been associated with increased dementia risk, especially with prolonged or cumulative exposure. PubMed Central (PMC)+1 ### 1\. First-generation antihistamines Examples include diphenhydramine, chlorpheniramine, hydroxyzine, and doxylamine. These can cause confusion and sedation and have strong anticholinergic effects. PubMed Central (PMC) ### 2\. Certain bladder medications Drugs such as oxybutynin, solifenacin, and tolterodine have anticholinergic properties. Oxybutynin has particularly strong evidence for adverse cognitive effects. PubMed Central (PMC) ### 3\. Certain older antidepressants Examples include amitriptyline, imipramine, nortriptyline, and paroxetine. Their anticholinergic and sedating effects can be problematic for some older adults. PubMed Central (PMC) ### 4\. Benzodiazepines Medicines such as diazepam, lorazepam, and alprazolam can cause sedation, impaired memory, confusion, and falls. They require particular caution in older adults. PubMed Central (PMC) ### 5\. Certain antipsychotics These medicines can have significant neurological side effects. In people who already have dementia, some antipsychotics are associated with increased stroke risk and greater cognitive decline and mortality and are generally avoided for behavioral symptoms unless specific circumstances justify their use. PubMed Central (PMC) ### 6\. Some motion-sickness and anti-nausea medicines Examples include meclizine, dimenhydrinate, and promethazine, which can have substantial anticholinergic effects and cause drowsiness or confusion. PubMed Central (PMC) ### 7\. Certain muscle relaxants Some, including cyclobenzaprine and orphenadrine, have anticholinergic effects and can cause sedation and confusion, particularly in older adults. PubMed Central (PMC) ### 8\. Opioids and other strongly sedating medicines Opioids can contribute to confusion and delirium, particularly in vulnerable older adults. Combining multiple central-nervous-system medicines can further increase risks such as falls and cognitive impairment. PubMed Central (PMC) ## ⚠️ Don’t stop medication suddenly A medication being associated with cognitive problems doesn’t mean it should automatically be discontinued. The underlying illness may itself affect cognition, and abruptly stopping certain medicines can be dangerous. If an older adult develops new confusion or memory problems, ask a doctor or pharmacist to perform a complete medication review, including over-the-counter sleep aids and allergy medicines. The National Institute on Aging specifically recommends reviewing anticholinergics, antihistamines, narcotics, sedatives, and benzodiazepines when assessing possible medication-related cognitive decline. National Institute on Aging Sudden confusion is an emergency. If confusion develops abruptly—particularly with facial drooping, weakness, speech difficulty, or vision problems—seek emergency medical attention because stroke or delirium may be involved.

Adminon September 11, 2026September 11, 2026

🚨 Alert: 8 Types of Medicines That May Affect Memory and Cognition

The headline “8 drugs that cause serious dementia” is misleading. No responsible medical source can say that eight specific medicines simply cause dementia. However, some medications—particularly those with anticholinergic or sedating effects—can cause confusion and cognitive problems and have been associated with increased dementia risk, especially with prolonged or cumulative exposure. PubMed Central (PMC)+1

1. First-generation antihistamines

Examples include diphenhydramine, chlorpheniramine, hydroxyzine, and doxylamine. These can cause confusion and sedation and have strong anticholinergic effects. PubMed Central (PMC)

2. Certain bladder medications

Drugs such as oxybutynin, solifenacin, and tolterodine have anticholinergic properties. Oxybutynin has particularly strong evidence for adverse cognitive effects. PubMed Central (PMC)

3. Certain older antidepressants

Examples include amitriptyline, imipramine, nortriptyline, and paroxetine. Their anticholinergic and sedating effects can be problematic for some older adults. PubMed Central (PMC)

4. Benzodiazepines

Medicines such as diazepam, lorazepam, and alprazolam can cause sedation, impaired memory, confusion, and falls. They require particular caution in older adults. PubMed Central (PMC)

5. Certain antipsychotics

These medicines can have significant neurological side effects. In people who already have dementia, some antipsychotics are associated with increased stroke risk and greater cognitive decline and mortality and are generally avoided for behavioral symptoms unless specific circumstances justify their use. PubMed Central (PMC)

6. Some motion-sickness and anti-nausea medicines

Examples include meclizine, dimenhydrinate, and promethazine, which can have substantial anticholinergic effects and cause drowsiness or confusion. PubMed Central (PMC)

7. Certain muscle relaxants

Some, including cyclobenzaprine and orphenadrine, have anticholinergic effects and can cause sedation and confusion, particularly in older adults. PubMed Central (PMC)

8. Opioids and other strongly sedating medicines

Opioids can contribute to confusion and delirium, particularly in vulnerable older adults. Combining multiple central-nervous-system medicines can further increase risks such as falls and cognitive impairment. PubMed Central (PMC)

⚠️ Don’t stop medication suddenly

A medication being associated with cognitive problems doesn’t mean it should automatically be discontinued. The underlying illness may itself affect cognition, and abruptly stopping certain medicines can be dangerous.

If an older adult develops new confusion or memory problems, ask a doctor or pharmacist to perform a complete medication review, including over-the-counter sleep aids and allergy medicines. The National Institute on Aging specifically recommends reviewing anticholinergics, antihistamines, narcotics, sedatives, and benzodiazepines when assessing possible medication-related cognitive decline. National Institute on Aging

Sudden confusion is an emergency. If confusion develops abruptly—particularly with facial drooping, weakness, speech difficulty, or vision problems—seek emergency medical attention because stroke or delirium may be involved.