When my husband was first diagnosed he consistently scored in the high 20s for the first few years. He was prescribed Donepezil from the beginning though. Over the 14 years since his diagnosis the score gradually began to drop. He is now on no mediation as he would score nil on the MMSE now.
I'm guessing he was a well educated man then lovely? Is that a factor do you think?
My mind is being slightly blown to discover that I was quite wrong re: scores and medication.