The psychiatrist recommended
Aricept, so I got a sample and tried it for a month. I have to say, it definitely made a difference. When I ran out, I waited for the cog fog to come back so I could tell whether it was the Aricept - and it did. So I got a prescription, and took it for five months. Each time I ran out, I waited until the fog returned, then got my script refilled. When the fog stayed away, I stopped taking it.