Donepezil doesnt actually "slow down " the Alzheimers - what it does is stimulate the brain so that they are able to make better use of what they have, so it appears to slow down the development of symptoms. Underneath it all, though, the Alzheimers is still progressing at the same rate.we jumped at the ‘slowing down’ argument but it’s impossible to tell whether it did slow it down
The side-effect of agitation/aggression happens because the brain gets over stimulated by the donepezil. There is also the point that it can be very difficult to pin point exactly what type of dementia it is and donepezil only works for Alzheimers. So if its not actually Alzheimers, but FTD or LBD, for example, then donepezil wont work.