Kate, John was originally diagnosed as AD, and was put on Reminyl straight away. (Pre NICE)
Four years later, after we'd moved up here, the consultant decided it wasn't AD at all, but PPA (which I'd never heard of).
He was doing so well on Reminyl he was kept on it, and it worked well until his infection last summer. That put him straight into end-stage, and obviously the med was having little or no effect, so he's now off it.
AD meds are not supposed to work for other kinds of dementia, but they do work for some people. It would be worth a try if you can talk the consultant into prescribing it.
Love,