7 Types of Medications That May Affect Memory and Thinking
Claims that certain medications “cause severe dementia and profound brain damage” are often exaggerated. Most medicines do not cause dementia, and many are important and beneficial when prescribed appropriately. However, some medications can affect memory, alertness, confusion, or thinking, especially in older adults, at higher doses, or when combined with other medicines.
If you are concerned about a medication, do not stop it suddenly—speak with your doctor or pharmacist.
1. Anticholinergic Medications
These medicines block acetylcholine, a chemical involved in memory and learning.
Examples include some:
- Bladder control medicines
- Older antihistamines
- Some medicines for dizziness or nausea
- Certain antidepressants
Possible effects:
- Dry mouth
- Constipation
- Confusion
- Drowsiness
- Memory problems
Long-term exposure to a high anticholinergic burden has been associated in some studies with a higher risk of cognitive decline, particularly in older adults.
2. Benzodiazepines (Certain Anxiety and Sleep Medicines)
Examples include:
- Diazepam
- Lorazepam
- Alprazolam
Possible effects:
- Drowsiness
- Slower thinking
- Problems with memory
- Increased risk of falls
Long-term use, especially in older adults, is usually reviewed carefully.
3. Some Sleep Medications
Certain prescription sleep aids can cause:
- Next-day drowsiness
- Confusion
- Problems with attention or balance
Doctors often consider alternatives, especially for long-term insomnia management.
4. Opioid Pain Medicines
Examples include medicines containing:
- Morphine
- Oxycodone
- Hydrocodone
Possible effects:
- Sleepiness
- Confusion
- Reduced alertness
Risk is higher with larger doses or when combined with alcohol, sedatives, or other medicines that slow the brain.
5. Some Antipsychotic Medicines
These medicines are used for conditions such as schizophrenia, bipolar disorder, and severe behavioural symptoms in certain illnesses.
In some older people with dementia, certain antipsychotics can increase the risk of serious complications and are used cautiously.
6. Some Anti-Seizure Medicines
Certain anticonvulsants can affect:
- Concentration
- Alertness
- Memory
However, they may be essential for preventing seizures, so any changes should be medically supervised.
7. Some Corticosteroids (Steroids)
Medicines such as prednisone can sometimes affect the brain, especially at higher doses.
Possible effects:
- Mood changes
- Anxiety
- Sleep disruption
- Confusion (rarely)
Important: Confusion Is Not Always Dementia
Medication-related cognitive changes may be:
- Temporary
- Reversible after adjusting treatment
- Caused by interactions between medicines
Sudden confusion in an older adult can also be a sign of delirium, infection, dehydration, or another urgent medical issue.
Talk to a Healthcare Professional If You Notice:
- New memory problems after starting a medication
- Increasing confusion
- Excessive sleepiness
- Falls or loss of balance
- Difficulty managing everyday tasks
