What would happen if a mentally healthy person started taking Alzheimers medications?

A doctor once described those drugs as “powerful, mind-altering drugs.” Since Alzheimers is now the diagnosis of the day for the elderly, (just like ADHD used to be for three year olds, but now Autisim is all the rage), it makes you wonder how many older people have been misdiagnosed with Alzheimers started on the drugs and went slowly crazy, and people just blew the changes in the person off to the Alzheimers—that they didn’t have.

Anyone out there have any idea what the effects of the drugs would be on a healthy individual?