What do you do if a patient with ADHD on dexamfetamine for many years develops Alzheimer's disease?

The issue with the diagnosis of ADHD is that adult-onset ADHD particularly, in my opinion, has major validity problems including a wide differential diagnosis, with no biomarkers. Also, it is now thought that Alzheimer's disease has a long prodrome (15-20 years) from being asymptomatic to having problems with executive functions, eventually evolving into the typical amnestic phenotype and then accumulating multiple domain cognitive impairment. It is likely that drugs such as stimulants can conti...

I am afraid your question is unclear.