Some medications can cause confusion, drowsiness, memory problems, or difficulty concentrating, particularly in older adults. But the claim that these drugs simply “cause serious dementia” is too strong.
In many cases, medication-related cognitive problems can improve after the medication is reduced or stopped under medical supervision. Some drugs may also increase the risk of cognitive impairment, especially with long-term use or when several medications with similar effects are taken together.
Here are eight important medication groups to know about.
1. Benzodiazepines
Examples include medications such as diazepam, lorazepam, and alprazolam.
These drugs can cause sedation, impaired attention, slowed thinking, and memory problems. The risk can be greater in older adults and with prolonged use.
Important: Don’t suddenly stop a benzodiazepine if you’ve been taking it regularly. Withdrawal can be dangerous, so any reduction should be planned with a healthcare professional.
2. First-Generation Antihistamines
Some older antihistamines have strong anticholinergic effects.
Examples include diphenhydramine and chlorpheniramine. They can cause drowsiness, confusion, blurred vision, constipation, and difficulty concentrating.
Older adults are particularly susceptible to these effects.
3. Certain Bladder Medications
Some medications used to treat overactive bladder can have anticholinergic effects.
Examples include oxybutynin and similar medications. In susceptible people, these drugs can contribute to confusion or memory difficulties.
If you’re experiencing cognitive changes after starting one, ask your doctor whether another treatment might be appropriate.
4. Some Antidepressants
Certain older antidepressants, particularly tricyclic antidepressants, can have anticholinergic effects.
Examples include amitriptyline and imipramine.
These medications can be very useful for some medical conditions, but their side effects need to be considered—especially in older adults or people taking several medications.
5. Certain Antipsychotic Medications
Antipsychotic drugs can cause sedation and other effects that may impair alertness and thinking.
They can be appropriate and important treatments for specific psychiatric or neurological conditions, so they should never be stopped abruptly without medical advice.
6. Opioid Pain Medications
Opioids such as morphine, oxycodone, and hydrocodone can cause drowsiness, slowed thinking, confusion, and impaired attention.
The risk can become greater when opioids are combined with other sedating medications, particularly benzodiazepines.
7. Some Anti-Seizure Medications
Certain anticonvulsants can cause sleepiness, slowed processing, dizziness, or problems with concentration.
However, these medicines can be essential for preventing seizures, so the benefits and risks need to be considered individually rather than assuming they should be discontinued.
8. Corticosteroids
Medications such as prednisone can sometimes produce changes in mood, sleep, concentration, or behavior.
These effects are more likely with higher doses, although individual responses vary considerably.
Does Taking These Drugs Mean You Will Develop Dementia?
No.
This is an important distinction. A medication that can cause confusion or cognitive side effects isn’t necessarily proven to cause permanent dementia.
Medication-related cognitive symptoms can sometimes resemble dementia, particularly in older adults. Doctors may therefore review a person’s medications when new memory problems or confusion appear.
At the same time, some research has raised concerns about long-term exposure to certain medications with strong anticholinergic properties and later dementia risk. This doesn’t establish that every person taking such a medication will develop dementia.
Never Stop Prescription Medication Suddenly
If you’re concerned that a medication may be affecting your memory, don’t stop it on your own.
Instead, ask your doctor or pharmacist to review:
- Every prescription medication you’re taking
- Over-the-counter medicines
- Sleep aids
- Allergy medicines
- Supplements
- Dosages and duration of use
- Potential drug interactions
Sometimes simply changing the dose, switching medications, or eliminating an unnecessary medicine can improve cognitive symptoms.
When Confusion Needs Urgent Attention
Sudden confusion, severe drowsiness, difficulty speaking, weakness on one side, facial drooping, loss of consciousness, or a sudden major change in mental status should receive urgent medical evaluation.
The key message is simple: some medications can affect memory and thinking, but it is inaccurate to say that eight specific drugs automatically cause serious dementia. Medication reviews are particularly important when an older person develops new confusion or memory problems.