Most Alzheimer's patients are elderly and are more likely to have concerns with all medications. Alzheimer’s medications may not pass as quickly through the bodies of elderly patients as they do younger patients. As a result, elderly people may be especially likely to experience certain side effects associated with Alzheimer’s medications, including gastrointestinal problems and loss of weight.

Additionally, elderly people are more likely to be taking other medications that may interact with Alzheimer’s medication or have conditions that may affect the potency or side effects of Alzheimer’s medications. This is especially the case if the patients have conditions such as kidney, lung or heart disease.