7 Medications That May Affect Memory and Brain Function: What You Should Know
Claims that certain medications “cause severe dementia and profound brain damage” are often overstated. Most medications do not directly cause dementia, and many are important and beneficial when properly prescribed. However, some medicines can cause confusion, drowsiness, slowed thinking, or memory problems, especially in older adults, at higher doses, or when multiple medications are combined.
If you notice new confusion or memory changes after starting a medicine, do not stop it suddenly—talk with your healthcare professional first.
1. Anticholinergic medications
These medicines block acetylcholine, a brain chemical involved in memory and thinking.
Examples include some:
- Older antihistamines used for allergies or sleep
- Certain bladder-control medicines
- Some medications for dizziness or nausea
Possible effects:
- Confusion
- Dry mouth
- Constipation
- Trouble concentrating
Long-term use of some strong anticholinergic medicines has been associated in studies with a higher risk of cognitive decline, but this does not mean they directly cause dementia in every person.
2. Benzodiazepines (some anxiety and sleep medicines)
Examples include:
- Diazepam
- Lorazepam
- Alprazolam
Possible effects:
- Sleepiness
- Slower reaction time
- Memory difficulties
- Increased fall risk
Long-term use, especially in older adults, is often reviewed carefully because of these risks.
3. Some sleep medications
Certain prescription sleep aids may cause:
- Next-day drowsiness
- Confusion
- Problems with attention or coordination
Older adults may be more sensitive to these effects.
4. Opioid pain medicines
Examples include:
- Oxycodone
- Hydrocodone
- Morphine
Possible effects:
- Sleepiness
- Slowed thinking
- Confusion, especially with higher doses or other sedating medicines
5. Some anti-seizure medications
Certain anticonvulsants can affect:
- Alertness
- Concentration
- Memory
The effect varies by medication, dose, and the individual.
6. Corticosteroids (when used at high doses or for long periods)
Examples include:
- Prednisone
Possible effects:
- Mood changes
- Insomnia
- Confusion or agitation in some people
7. Some medications with sedating effects or complex interactions
Taking multiple medicines that affect the brain can increase the risk of:
- Delirium (sudden confusion)
- Drowsiness
- Falls
- Difficulty thinking clearly
This is especially important for older adults taking several prescriptions
