Global Health 2026-02-21 08:30

New Research Suggests Common Blue Pill Could Help Prevent Dementia

New research suggests that three existing medications, including sildenafil (commonly known as Viagra), may help prevent or treat Alzheimer's disease. This finding offers a promising new avenue for developing faster and more cost-effective treatments for dementia.

Alzheimer's DiseaseDementiaDrug RepurposingHealth ResearchNeuroscience
New Research Suggests Common Blue Pill Could Help Prevent Dementia

Research Background

Creating entirely new drugs can take 10 to 15 years and cost billions of pounds, with no certainty of success. In contrast, repurposing medicines that are already licensed and widely prescribed could offer a quicker, safer, and more cost-effective route to innovative Alzheimer's treatments.

Research Process and Findings

Published in the journal Alzheimer's Research and Therapy, the study was conducted by an international team of 21 dementia specialists from universities, hospitals, the pharmaceutical industry, and people living with dementia. They evaluated 80 existing drugs to identify those showing the greatest promise for treating or preventing Alzheimer's disease. Following several rounds of assessment, the panel identified three "priority candidates."

Details of the Three Candidate Drugs

Each drug was selected because it targets biological mechanisms linked with Alzheimer's, has shown encouraging results in cell and animal studies, and is considered safe for older adults.

  • Shingles Vaccine (Zostavax): Demonstrated the most significant potential for Alzheimer's prevention. Given that alterations to the immune system play a role in Alzheimer's, this vaccine interacts with the immune system in a way that could potentially offset some of these harmful changes.
  • Sildenafil (Viagra): Research suggests it may protect nerve cells and reduce the build-up of tau protein. Studies on mice showed that sildenafil improved cognitive function and memory, possibly through enhanced blood flow to the brain. Approximately 16 million people worldwide are believed to use it.
  • Riluzole: Currently used to treat motor neurone disease. In animal research, it has shown improved cognitive performance and decreased levels of tau protein linked to Alzheimer's.

Next Steps

Experts are now advocating for clinical trials to establish whether these drugs truly provide benefits to people living with Alzheimer's or those at risk. Of the three treatments, the shingles vaccine emerged as particularly noteworthy due to its requirement of only two doses and well-documented safety profile.