"The PROBLEM with most Government and University informational websites is that no attempt is made to critique the research reports, making it impossible for others to understand the significance of these data. There is much controversy regarding the causality of TSEs(and Alzheimer's). Our research shows that prion amyloid (the TSE research focus for the past 30 years) is the result of a bacterial infection. This controversy directly reflects on Louis Pasteur's efforts to prove that replicating crystals are not the cause of infectious disease, but instead bacteria are the culprits. Too bad we have to rehash this controversy."
Dr. Frank Bastian (more at tseresearchcenter.org )

There is no cure for Alzheimer's disease, but there are drugs that can slow its progression—thus, if the disease could be diagnosed earlier, before obvious mental impairments present, treatment could begin earlier, giving patients more productive years.

This is exactly where the problem really lies.
There's a quick jump to use drugs instead of finding the real cause and dealing with it.

So far most indications are that too much sugar in the diet plus an overload of transformed omega-3 fats are responsible. Ingesting a constant load of trans-fats from roasting nuts or vegetable fats for instance, coupled to lack of exercise are most likely the main culprits.

So reversing or eliminating those issues should be the first port of call, NOT drugs.