It is extremely unlikely that a drug could prevent damage from repeat concussions. Blunt force trauma to the brain causes a plethora of cascading cellular injur

It is extremely unlikely that a drug could prevent damage from repeat concussions. Blunt force trauma to the brain causes a plethora of cascading cellular injuries and responses. A single drug might limit damage from one of those pathways, but it's certainly not going to render a concussion harmless. Just like a single drug isn't going to be a cure for a gunshot.