Hi
@rachl999, and welcome. I'm new here too. Regarding your dad's medication, Aricept (donepezil) and Namenda (memantine), was he taking them as pills or in another form? I was wondering if he's having difficulty swallowing, as often happens in advanced Alzheimer's disease. Donepezil can be administered via a transdermal patch, while memantine can be taken in liquid form, avoiding the need to swallow pills.
If he's finding it hard to swallow pills, that would explain his refusal, as it would've been causing him anxiety. Donepezil and memantine are widely regarded as two of the very few medications that can do anything at all meaningful for Alzheimer's patients. Don't beat yourself up over stopping the medication. If it's only been a few days since they were stopped, try to encourage him to take them, but don't force him to, obviously. If there's a time of day when he's more lucid, it might be worth trying then, rather than at a fixed time of day which might not be when he's at his best.
If it's been more than a week since he's taken them, it would be best to get medical advice before starting again.
In any event, it's definitely a good idea have him on the medication in a non-pill format. Memantine is likely to help with his behavioural issues. Donepezil may just help him feel a bit more like himself, but if he can take it in a way that doesn't cause him any distress, then it's worth continuing with it in my opinion.
As for anti-anxiety medication in advanced Alzheimer's patients, I think the picture is rather mixed as you've already seen. A doctor would (hopefully) know more than a layperson like me, or at have access to the best clinical guidance.