My wife, like many others diagnosed with MCI or AD, was put on a regimen of Aricept, Namenda, and folbic acid. All of these claim they MIGHT slow down the rate of memory loss in SOME individuals for UP TO TWO YEARS, The three words in caps leave infinite wiggle room. My wife was on these for several years, the with the agreement of our primary care physician stopped all of them. I have noticed NO change. In fact, when she was taking them, I noticed no change. This may be because I had no way of knowing where she would be if she had never taken them. I find this to be the fallacy in the Drug company claims - no one knows where anyone would be if the drugs were not taken. The disease affects everyone in a different way, so where their tests show a slowing in some, this may be the normal progression for these individuals.
Also, all drugs to date are based on the "fact" that AD is caused by the formation plaques and tangles in the brain, and are geared towards destroying them. However there are new studies that come up with the alternate theory that plaques are in fact the bodies way of fighting proteins called oligomers, If this is the case, the old drugs may in fact be causing more harm. The truth is no one knows the cause for AD, let alone know what helps or cures it.