Title: Six Common Medications May Reduce Dementia Risk, Studies Suggest

Several common medications, including vaccines, heart medications, and anti-inflammatory drugs, may lower the risk of dementia, according to observational studies. While these findings suggest a correlation, researchers emphasize that causation has not been established and further investigation is needed to determine whether the drugs directly benefit brain health or if the association reflects other health behaviors.

Getting an annual flu shot may come with a significant side benefit: helping to protect against dementia. Numerous studies have found that older adults who were vaccinated against the flu had a lower risk of developing dementia in the years that followed compared to those who were not vaccinated. In one study, the risk was as much as 40 percent lower. Research published earlier this month has bolstered that evidence, showing that older adults who received a higher dose of the flu vaccine — commonly recommended for people 65 and over — had an even lower probability of developing Alzheimer’s disease compared to those who received the standard dose.

Other common medications have also been associated with reduced dementia risk. Statins and drugs that treat high blood pressure are each linked to a roughly 10% to 15% reduced risk of dementia in observational studies. Similarly, some observational studies have found that people with diabetes who took newer GLP-1 medications had a lower risk of developing Alzheimer’s, with risk reductions as high as 45 percent in certain analyses.

Dr. Paul Schulz, a professor and neurologist at UTHealth Houston who led a recent study on flu vaccination and dementia risk, noted that people who tend to get vaccinated are also more likely to engage in other health-promoting behaviors, such as taking blood pressure and cholesterol medications as directed. “People who tend to get vaccinated are the people who go to see a doctor, and then they follow the directions to take their blood pressure pills and cholesterol pills, which also reduce the risk of Alzheimer’s,” he said.

Experts caution that while these associations are intriguing, they do not prove that the medications themselves prevent dementia. It remains possible that underlying health status, access to care, or other lifestyle factors explain both medication use and lower dementia risk. Determining causation will require further research, including clinical trials designed to isolate the effects of these drugs on brain health over time.

Public health officials continue to recommend vaccinations, including the annual flu shot, for their proven benefits in preventing infectious diseases. For individuals managing conditions like diabetes, hypertension, or high cholesterol, adherence to prescribed treatments remains important for overall health. Any potential cognitive benefits should be viewed as an area of ongoing scientific inquiry rather than a guaranteed outcome of medication use.