Erectile dysfunction drugswork by increasing blood flow to the penis.
For the trial, participants had two magnetic resonance imaging scans (MRIs) at least one week apart.
The goal was to see if MRIs showed increased blood flow with tadalafil.
There is some previous research to suggest that erectile dysfunction drugs might play a role inpreventing dementia.
Anything that increases blood flow will have a beneficial effect on brain function, Dr. Horovitz said.
