Should I stop a medicine if I think it is affecting my memory?

No. Some medicines, especially sedatives and benzodiazepines, can cause serious problems if stopped abruptly. Write down the symptom, timing, and medicine changes, then speak with a doctor, pharmacist, or qualified health professional about a safe review plan.

Are anticholinergic medicines the main group to ask about?

They are one of the most important groups because they can affect attention and memory, and cumulative exposure has been associated with dementia risk in observational research. Ask whether any medicine on your list adds anticholinergic burden.

Can over-the-counter sleep or allergy products matter?

Yes. Some older antihistamines used for allergy symptoms or sleep are strongly anticholinergic. They may be easy to overlook because they are bought without a prescription, so include them in every medication review.

What makes medication stacking risky?

Several brain-active medicines can add up. Sedatives, opioids, antipsychotics, antidepressants, gabapentinoids, sleep medicines, and muscle relaxants may increase sleepiness, falls, confusion, or impaired alertness when combined.

When is confusion an emergency?

Sudden confusion, confusion after a head injury, loss of consciousness, trouble breathing, fever, danger to self or others, or a first unexplained episode should be treated as urgent. Call emergency services or seek immediate medical help.

7 Medication Groups That Can Affect Memory and Thinking

A clinician and older adult calmly review medicines together at a desk. | lilicooks.com

Some medicines can affect memory and thinking, but the safer takeaway is not that a simple list of common drugs inevitably leads to dementia. The real issue is risk: certain medication groups can cause confusion, sedation, delirium, or cognitive impairment in susceptible people, and a few have been associated with higher dementia risk in observational research. The most practical step is a medication review, especially for older adults, people with existing memory concerns, and anyone taking several brain-active medicines at once.

Why This Topic Needs Careful Wording

Memory changes have many possible causes, including sleep loss, infection, metabolic problems, vitamin deficiency, mood conditions, alcohol or drug exposure, and medicine side effects. MedlinePlus describes confusion as difficulty thinking clearly or quickly and lists medicines among possible causes; it also notes that sudden confusion can require urgent help, particularly when other serious symptoms are present. That matters because a medicine-related episode may look frightening, yet it may be different from a progressive dementia diagnosis. Source: MedlinePlus.

The most useful question is not, "Which drug is always dangerous?" It is, "Which medicines on my list could be affecting attention, memory, balance, sleep, or alertness, and do the benefits still outweigh the risks for me?" The American Geriatrics Society Beers Criteria is one major clinical reference for potentially inappropriate medicine use in adults 65 and older. It is meant to support shared decisions, not replace individual judgment, and it highlights several medicine groups that can be problematic in older adults. Source: American Geriatrics Society Beers Criteria.

Seven medication groups deserve particular attention in a memory-focused review:

Strong anticholinergics, including some older antihistamines, bladder medicines, gastrointestinal antispasmodics, and anti-Parkinson medicines.
Strongly anticholinergic antidepressants, such as several tricyclics and paroxetine.
Benzodiazepines, such as alprazolam, diazepam, clonazepam, lorazepam, and temazepam.
Z-drug sleep medicines, such as zolpidem, zaleplon, and eszopiclone.
Opioid medicines, especially when combined with other sedating medicines or alcohol.
Antipsychotic medicines, particularly in people already living with dementia unless there is a clear clinical reason.
Multiple central nervous system-active medicines, including some antiseizure medicines, gabapentinoids, antidepressants, muscle relaxants, sedatives, and pain medicines used together.

Unlabeled medicine bottles beside a brain model and magnifying glass. | lilicooks.com

1. Strong Anticholinergics Can Blur Thinking

Anticholinergic medicines block acetylcholine, a chemical messenger involved in memory, attention, and many body functions. Some are sold over the counter, such as older allergy or sleep products containing diphenhydramine or doxylamine. Others are prescribed for bladder urgency, stomach cramps, motion sickness, or Parkinson-related symptoms. The Beers Criteria describes first-generation antihistamines as highly anticholinergic and warns about confusion and other anticholinergic effects in older adults, while also noting that cumulative exposure is associated with falls, delirium, and dementia. Source: American Geriatrics Society Beers Criteria.

The long-term signal is strongest for cumulative exposure rather than a single occasional dose. A prospective cohort study in JAMA Internal Medicine followed 3,434 adults age 65 or older without dementia at entry and found a dose-response association between higher cumulative strong anticholinergic use and later dementia diagnosis. This kind of study cannot prove that the medicine alone caused the outcome for every person, but it is strong enough to justify asking whether a lower-burden option exists when long-term use is being considered. Source: JAMA Internal Medicine.

2. Anticholinergic Antidepressants Need Individual Review

Some antidepressants have strong anticholinergic activity in addition to their intended mood effects. The Beers Criteria lists amitriptyline, clomipramine, imipramine, nortriptyline, paroxetine, and related medicines as highly anticholinergic and sedating in older adults. These medicines may still be used for specific reasons, but they are worth reviewing when a person has new forgetfulness, daytime sleepiness, falls, constipation, urinary retention, or a growing list of medicines with similar effects. Source: American Geriatrics Society Beers Criteria.

3. Benzodiazepines Can Affect Alertness, Memory, and Safety

Benzodiazepines are used in selected situations for anxiety, sleep, seizure disorders, procedures, or withdrawal care, but they also act on the central nervous system. In older adults, the Beers Criteria says benzodiazepines increase risk of cognitive impairment, delirium, falls, fractures, and motor vehicle crashes. The FDA also warns that people should not abruptly stop benzodiazepines without a plan from a health professional because dependence and withdrawal reactions can be serious. Sources: American Geriatrics Society Beers Criteria and FDA benzodiazepine safety communication.

A pharmacist helps an older adult review medicines at a counter. | lilicooks.com

4. Z-Drug Sleep Medicines Are Not Risk-Free

Z-drugs, including zolpidem, zaleplon, and eszopiclone, are often perceived as gentler than older sedatives. The Beers Criteria does not treat them as harmless substitutes in older adults. It notes that these medicines have adverse events similar to benzodiazepines, including delirium, falls, fractures, emergency visits, hospitalizations, and motor vehicle crashes, with only modest sleep benefits on average. If a sleep medicine is followed by morning grogginess, unusual nighttime behavior, falls, or memory gaps, that pattern belongs in a medication review rather than being dismissed as normal aging.

5. Opioids and Sedating Combinations Can Cloud Thinking

Opioids can cause drowsiness, dizziness, slowed breathing, constipation, and impaired alertness. The concern rises when opioids are combined with benzodiazepines, alcohol, or other central nervous system depressants. The FDA required boxed warnings for opioids and benzodiazepines used together because the combination can lead to extreme sleepiness, respiratory depression, coma, and death. The Beers Criteria also warns against opioid-benzodiazepine combinations and notes serious sedation-related concerns when opioids are combined with gabapentin or pregabalin. Sources: FDA opioid and benzodiazepine warning and American Geriatrics Society Beers Criteria.

6. Antipsychotics Carry Special Concerns in Dementia

Antipsychotic medicines can be important in specific psychiatric and neurologic situations. They also require caution, especially in people already living with dementia. The Beers Criteria states that antipsychotics are linked with increased risk of stroke, faster cognitive decline, and mortality in persons with dementia, while recognizing exceptions for FDA-approved indications and selected short-term uses. This is one reason agitation, hallucinations, distress, or sleep disruption in dementia should not automatically lead to a long-term sedating medicine without careful assessment of causes, risks, and non-drug supports.

An educational illustration connects medicines with sleep and alertness concepts. | lilicooks.com

7. Medication Stacking May Matter More Than One Name

A person may tolerate one central nervous system-active medicine but struggle when several are layered together. The Beers Criteria highlights increased fall and fracture risk when three or more CNS-active groups are used at the same time, including antiepileptics, gabapentinoids, antidepressants, antipsychotics, benzodiazepines, Z-drugs, opioids, and skeletal muscle relaxants. It also lists common muscle relaxants such as cyclobenzaprine, methocarbamol, carisoprodol, and orphenadrine as poorly tolerated by many older adults because of anticholinergic effects, sedation, and fracture risk. Source: American Geriatrics Society Beers Criteria.

What About PPIs, Corticosteroids, and Statins?

These three groups often appear in alarming online lists, but they need more precise wording. Proton pump inhibitors are not established as a direct dementia cause. A more grounded concern is that long-term use of gastric acid inhibitors, including proton pump inhibitors, can affect vitamin B12 status in some people; NIH notes that vitamin B12 deficiency can include neurologic changes and, in severe cases, dementia-like features. Source: NIH Office of Dietary Supplements.

Systemic corticosteroids can affect mood, sleep, memory, and clear thinking, particularly when taken by mouth or through a vein. Mayo Clinic lists mood swings, issues with memory and behavior, and not thinking clearly among possible side effects of oral corticosteroids. That is a reason to report changes promptly, not a reason to abandon a medicine that may be necessary for asthma, autoimmune disease, or another serious condition. Source: Mayo Clinic.

Statins are another area where nuance matters. FDA-approved labeling for atorvastatin notes rare postmarketing reports of cognitive impairment, including memory loss, forgetfulness, amnesia, memory impairment, and confusion, generally described as nonserious and reversible after discontinuation. That label language does not mean statins are a common cause of dementia, and many people take them because their cardiovascular risk picture makes them useful. If memory symptoms begin after a medication change, the safest step is to report the timing to the prescriber. Source: DailyMed atorvastatin label.

How to Prepare for a Medication Review

Bring every prescription, over-the-counter product, sleep aid, allergy medicine, supplement, and occasional pain medicine to the same conversation. Include who prescribed it, why it was started, when it is taken, and whether memory changes, dizziness, falls, confusion, or daytime sleepiness appeared after a change. Ask specifically about anticholinergic burden, sedating combinations, kidney function, alcohol use, duplicate ingredients, and whether any medicine is still needed for the original reason. A pharmacist can often identify overlap, and a doctor can weigh that information against the medical condition the medicine is meant to manage.

When Confusion Is Urgent

Sudden confusion is different from mild forgetfulness that develops gradually. MedlinePlus advises calling emergency services when confusion comes on suddenly, when it is the first unexplained episode, when it follows a head injury, when the person becomes unconscious, or when the person may harm themselves or others. Other red flags include trouble breathing, fever, fast pulse, severe dizziness, clammy skin, headache, or uncontrolled shivering. Source: MedlinePlus.

The Bottom Line

The highest-value lesson is not fear of every medicine. It is pattern recognition. If thinking changes after a new medicine, a higher amount, a pharmacy substitution, an added sleep aid, or a new combination, write down the timing and ask for a structured review. If the change is sudden or severe, treat it as urgent. If the change is gradual, a medication review is still worthwhile because reducing avoidable anticholinergic or sedating burden may clarify what is truly happening.

Wrap-Up

Several medicine groups can affect memory, alertness, or delirium risk, and some anticholinergic medicines have been associated with later dementia in observational studies. The safest response is not abrupt stopping; it is a complete medication review with a doctor, pharmacist, or qualified health professional, especially for older adults, people with existing cognitive concerns, and anyone taking several CNS-active medicines.

Frequently Asked Questions

→ Should I stop a medicine if I think it is affecting my memory?: No. Some medicines, especially sedatives and benzodiazepines, can cause serious problems if stopped abruptly. Write down the symptom, timing, and medicine changes, then speak with a doctor, pharmacist, or qualified health professional about a safe review plan.
→ Are anticholinergic medicines the main group to ask about?: They are one of the most important groups because they can affect attention and memory, and cumulative exposure has been associated with dementia risk in observational research. Ask whether any medicine on your list adds anticholinergic burden.
→ Can over-the-counter sleep or allergy products matter?: Yes. Some older antihistamines used for allergy symptoms or sleep are strongly anticholinergic. They may be easy to overlook because they are bought without a prescription, so include them in every medication review.
→ What makes medication stacking risky?: Several brain-active medicines can add up. Sedatives, opioids, antipsychotics, antidepressants, gabapentinoids, sleep medicines, and muscle relaxants may increase sleepiness, falls, confusion, or impaired alertness when combined.
→ When is confusion an emergency?: Sudden confusion, confusion after a head injury, loss of consciousness, trouble breathing, fever, danger to self or others, or a first unexplained episode should be treated as urgent. Call emergency services or seek immediate medical help.

References

This content was developed and refined using reliable sources.

Memory Changes, Dementia Risk, and 7 Medication Groups to Review