Dementia is not often confused with alcoholism.
The anti-alcoholism drug "Librium" can cause a dementia that appears to be Alzheimer's. It should only be used for a very short time (like 2 weeks), but it is sometimes prescribed longer, and people think the patient coincidentally has acquired dementia.
Horrible, evil drug. There are far, far better anti-alcoholism drugs.
I think I might have watched that show twice... and the Monkees once.... since this a family site I’ll refrain from commenting further.