Selective Amyloid Inhibitor.
One cause of Alzheimers is misfolded proteins -- for example Amyloid and Tau proteins. These guys are supposed to make up the physical part of the brain. But sometimes they are shaped wrong and just gum up the brain and stop it sending electrical signals properly. These deposits of bad proteins are called plaques.
The good news is you can just remove the plaques and the brain will go back to normal function. For that just tell your futuristic Holo-Doctor to engineer a selective amyloid inhibitor.
The hard part is designing the inhibitor to remove the plaques without damaging the correctly formed Amyloids. But Holo-Doc is up to the task. After all his holomatrix is programmed with the collective medical knowledge of all known sentient species; and he has quantum heuristic algorithms to devise new treatments.