I am on Aricept 5's and scheduled for my PET Scan next Friday. Been on Aricept for one year and my doctor says once I get on Leqembi, I should continue to take my Aricept. I'll let you know my PET Scan Centeloid score when I get it. Good luck. The Aricept 5's worked wonders on my memory issues but I didn't progress to the 10's as I felt they were too strong when I tried them.