7 Medications That Can Affect Memory and Cognition
The claim that these medicines “cause severe dementia and profound brain damage” is too strong. Some medications can cause confusion, delirium, sedation, or memory problems—especially in older adults—but that does not mean they inevitably cause dementia or permanent brain damage. The American Geriatrics Society identifies several medication classes as potentially inappropriate for many adults aged 65 and older because of these and other risks. American Geriatrics Society+1
1. First-Generation Antihistamines
Examples include diphenhydramine and chlorpheniramine. Their anticholinergic effects can cause confusion, drowsiness, and other cognitive problems, particularly in older adults.
2. Tricyclic Antidepressants
Medicines such as amitriptyline and imipramine have significant anticholinergic effects and may contribute to confusion and impaired cognition in susceptible older adults.
3. Bladder Anticholinergics
Oxybutynin and related medicines can affect cognitive function because they interfere with acetylcholine signaling in the nervous system.
4. Benzodiazepines
Examples include diazepam, lorazepam, alprazolam, and clonazepam. They can cause sedation, impaired memory, confusion, and delirium, particularly in older adults. The FDA also warns about dependence and potentially dangerous withdrawal. U.S. Food and Drug Administration
Do not suddenly stop a benzodiazepine if you’ve been taking it regularly; withdrawal can include seizures and can be life-threatening. U.S. Food and Drug Administration
5. Z-Drug Sleeping Pills
Zolpidem, zaleplon, and eszopiclone can cause sedation, impaired alertness, falls, and cognitive problems. They are among the medications that geriatric prescribing guidance recommends avoiding in many older adults. American Geriatrics Society
6. Antipsychotic Medications
Medicines such as quetiapine, risperidone, olanzapine, and haloperidol can be appropriate for specific medical conditions, but they carry important risks in older adults with dementia and require careful medical supervision.
7. Combinations of Anticholinergic Medicines
Sometimes the concern isn’t one medication but several medicines with anticholinergic properties taken together. Higher anticholinergic burden is associated with increased risks of cognitive decline, delirium, falls, and fractures. American Geriatrics Society
Don’t Stop Prescribed Medicines on Your Own
A medication on this list isn’t necessarily inappropriate for you. The benefits may outweigh the risks depending on the condition being treated, dose, duration, age, and other medications.
If an older person develops new confusion, excessive sleepiness, memory problems, hallucinations, or major behavioral changes, a doctor or pharmacist should review all prescription medicines, over-the-counter drugs, and supplements.
Bottom Line
The evidence supports a more accurate message than “7 drugs cause severe dementia”: certain medications can significantly affect cognition, particularly in older adults, and medication burden matters. A professional medication review can identify potentially problematic drugs and safer alternatives when appropriate. American Geriatrics Society
