Aricept and Namenda are typically used in the treatment of early-stage Alzheimer's disease. They might also be helpful as the disease progresses, according to British investigators. Researchers found that later use helped users better remember, understand and function. "As patients progress to more severe forms of Alzheimer's disease, clinicians are faced with a difficult decision as to whether to continue or not with dementia drugs and, until now, there has been little evidence to guide that decision," said Robert Howard, M.D., the study's lead researcher. By 2050, as many as 16 million Americans are expected to be diagnosed with Alzheimer's.