Many people take medications every day without thinking much about how they might affect their brain health in the future.
Medicines can help control symptoms, improve quality of life, and treat many common health conditions. However, new research suggests that some widely used drugs may have an unexpected downside, especially for older adults.
Researchers at the University of California, San Diego have discovered that a group of medications known as anticholinergic drugs may increase the risk of memory and thinking problems later in life.
The findings raise important questions about how these medicines should be used, particularly among older people who may already be at risk of developing dementia.
Anticholinergic drugs are not a single medication. Instead, they are a large group of medicines used to treat a wide range of health problems.
Doctors may prescribe them for conditions such as high blood pressure, allergies, colds, bladder problems, depression, Parkinson’s disease, and other medical issues. Some of these medicines can be purchased without a prescription, while others require approval from a doctor.
These medications work by blocking the action of acetylcholine, an important chemical messenger in the nervous system.
Acetylcholine helps nerve cells communicate with each other and plays a major role in learning, memory, attention, and many other brain functions. While reducing the effects of this chemical can help relieve certain symptoms, it may also interfere with normal brain activity.
To better understand the possible long-term effects of these drugs, researchers followed 688 adults whose average age was 74 years. At the beginning of the study, none of the participants showed signs of memory loss or thinking problems.
The scientists asked each person about their medication use, including whether they had taken anticholinergic drugs at least once a week for six months or longer.
The participants then underwent yearly assessments over a period of 10 years. These tests measured memory, attention, language, and other thinking abilities. The long follow-up period allowed researchers to track changes in brain function over time.
About one-third of the participants reported regular use of anticholinergic medications. On average, these individuals were taking about five different medications. Among the most commonly reported drugs were Metoprolol, Atenolol, Loratadine, and Bupropion.
When the researchers analyzed the results, they found a clear pattern. People who used at least one anticholinergic medication had a significantly higher risk of developing memory problems compared with those who did not use these drugs. Overall, the risk was 47 percent higher among users of anticholinergic medications.
This finding is important because mild memory problems are often one of the earliest warning signs of Alzheimer’s disease and other forms of dementia. Although not everyone with memory issues will develop dementia, these changes can sometimes signal that disease processes are beginning in the brain.
The researchers also found that some people appeared to be especially vulnerable. Participants who already had biological signs linked to Alzheimer’s disease faced a much greater risk when taking anticholinergic drugs. In these individuals, the likelihood of developing memory problems was about four times higher.
The study also examined people who carried genes associated with a higher risk of Alzheimer’s disease. Among this group, anticholinergic drug use was linked to a 2.5-times greater chance of experiencing memory decline.
These results suggest that certain people may be more sensitive to the effects of medications that interfere with acetylcholine. For them, long-term use of these drugs could potentially speed up the development of memory and thinking difficulties.
As populations continue to age around the world, preventing dementia has become a major public health goal. Scientists are increasingly interested in identifying factors that can be changed before symptoms appear. Medication use is one factor that may be easier to modify than genetics or age.
The researchers emphasize that people should not stop taking prescribed medications on their own. Many anticholinergic drugs provide important benefits and may be necessary for managing serious health conditions.
Instead, patients should discuss any concerns with their healthcare provider. In some cases, doctors may be able to recommend alternative treatments that have less impact on brain function.
The findings also highlight the importance of regular medication reviews, particularly for older adults who often take multiple drugs at the same time. Reducing unnecessary medications may help lower potential risks while still maintaining good overall health.
The study was led by Lisa Delano-Wood and her research team. Their work provides valuable evidence that medications commonly used for everyday health problems may have effects that extend beyond their intended purpose. Understanding these risks may help doctors and patients make better decisions about treatment and brain health.
The research was published in the journal Neurology. The results suggest that paying closer attention to anticholinergic medications could become an important part of protecting memory and maintaining mental sharpness as people grow older.
If you care about dementia, please read studies about dietary strategies to ward off dementia, and how omega-3 fatty acids fuel your mind.
For more health information, please see recent studies about Choline deficiency linked to Alzheimer’s disease, and what to eat (and avoid) for dementia prevention.
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