Vascular dementia is the second-most common form of dementia, and new research suggests that Viagra, a medication used to treat erectile dysfunction, may reduce the risk of developing dementia in at-risk individuals. A recent study published in Circulation Research found that after participants took Viagra for three weeks, positive changes were seen in the behavior of blood vessels in the brain. This study, known as the OxHARP trial, has laid the foundation for future clinical trials. Due to its relatively safe nature and effects on multiple organs, including the heart, liver, kidney, and brain, Viagra is a promising candidate for repurposing as a treatment for various conditions.
Vascular dementia is caused by impaired blood flow or damaged blood vessels in the brain, often occurring after a stroke, and accounts for a significant percentage of dementia cases in North America and Europe. While there is no cure for vascular dementia, treatments are available to help manage symptoms and slow progression of the disease. Risk factors for vascular dementia include cerebral small vessel disease (CSVD), which is chronic damage to small blood vessels in the brain. The recent study recruited 75 participants with neurological signs of CSVD and tested the effects of sildenafil, placebo, and cilostazol on cerebral pulsatility, cerebrovascular reactivity, cerebrovascular resistance, and cerebral blood flow.
The study found that while sildenafil did not improve cerebral pulsatility, it did enhance cerebrovascular reactivity and resistance, as well as cerebral blood flow compared to placebo. Compared to cilostazol, Viagra had similar effects but produced fewer side effects. The enhanced cerebrovascular dynamics with sildenafil offer a new potential treatment to prevent the progression of CSVD, paving the way for further clinical trials. By inhibiting the enzyme phosphodiesterase 5 (PDE5), sildenafil promotes blood vessel relaxation and improves blood flow, potentially reducing the risk of dementia.
Previous research has also found positive associations between Viagra usage and a reduced risk of developing Alzheimer’s disease. Lifestyle factors such as a healthy diet, regular exercise, and mental and social activity can also play a role in lowering the risk of dementia. Moving forward, scientists will need to conduct long-term studies to assess whether Viagra and similar drugs can truly reduce the risk of vascular dementia. Future research will focus on determining the optimal dosage and drug within the group of drugs to further understand the potential benefits of sildenafil on reducing the risk of stroke and dementia.
