Discover 8 types of medications that may affect memory, confusion, or thinking, especially in older adults, and learn why reviewing medicines with a doctor or pharmacist matters.

Alert: 8 Types of Medicines That May Affect Memory and Thinking

Certain medications can cause side effects such as confusion, drowsiness, difficulty concentrating, or memory problems, particularly in older adults. However, it is important to understand that this does not mean these medicines automatically cause dementia.

The relationship between medications and long-term cognitive decline can be complicated. Some drugs may temporarily affect mental clarity, while other factors—including age, health conditions, medication combinations, dehydration, and sleep problems—can also contribute to confusion or memory changes.

1. Anticholinergic Medicines

Anticholinergic medications are used to treat a variety of conditions, including allergies, bladder problems, stomach issues, and other health concerns.

Some of these medicines can cause dry mouth, constipation, drowsiness, confusion, and memory difficulties. Older adults may be particularly sensitive to these effects.

2. Certain Sleep Medicines

Some prescription and over-the-counter sleep medicines can cause daytime drowsiness, reduced alertness, confusion, and problems with concentration.

Older adults may be more vulnerable to these effects, particularly when multiple medications are taken together.

3. Benzodiazepines

Benzodiazepines are prescribed for conditions such as anxiety and insomnia. They can affect alertness, coordination, and memory.

Because some can cause dependence and withdrawal symptoms, they should not be stopped suddenly without medical guidance.

4. Some Antidepressants

Certain antidepressants can have anticholinergic effects and may contribute to confusion or memory difficulties in some people.

However, depression itself can affect concentration and memory, so antidepressants should never be discontinued without discussing it with a healthcare professional.

5. Some Bladder-Control Medicines

Certain medicines used for overactive bladder can have anticholinergic effects. In susceptible people, these effects may include confusion or difficulty thinking clearly.

If cognitive symptoms appear after starting one of these medicines, ask your healthcare professional whether another treatment option may be appropriate.

6. Some Antihistamines

Older antihistamines can cause drowsiness and have anticholinergic effects. These effects may result in reduced alertness or confusion, especially in older adults.

Some newer antihistamines have fewer sedating effects, but the right choice depends on your individual health and other medications.

7. Certain Antipsychotic Medicines

Antipsychotic medications can be important treatments for certain psychiatric conditions, but they also carry significant risks in some older adults, particularly those with dementia.

These medicines should be used under appropriate medical supervision, with their benefits and risks reviewed regularly.

8. Some Pain Medicines

Certain pain medicines, especially opioids, can cause drowsiness, confusion, and impaired attention. These effects may become more pronounced when opioids are combined with other medicines that cause sedation.

If someone develops unusual sleepiness or confusion after starting or increasing a pain medicine, contact their healthcare professional.

Never Stop Medication Without Medical Advice

If you notice new memory problems after starting a medication, don’t stop taking it on your own.

Some medicines can cause withdrawal symptoms or other complications when stopped suddenly. A doctor or pharmacist can review your medications and determine whether a dosage adjustment, alternative treatment, or different schedule may be appropriate.

Other Causes of Memory Problems

Medication is only one possible reason for changes in memory or thinking. Sleep problems, depression, infections, dehydration, vitamin deficiencies, metabolic conditions, and neurological disorders can also cause cognitive symptoms.

Sudden confusion that develops quickly should receive prompt medical evaluation.

Final Thoughts

Some medications can affect memory, alertness, and thinking, particularly in older adults or when several medicines are taken together. However, it is misleading to claim that these medicines automatically cause dementia.

If you or a family member experiences new or worsening memory problems, speak with a healthcare professional and ask for a complete medication review. Never make major changes to prescription medicines without professional guidance.