My vet doesn't carry it and says the results aren't that good (other people bought it online (1800PetMeds, Amazon) and the results weren't all that great). It also is really $$$ here and I don't have that kind of money (if it was a drug with a good success rate or necessary for life (cushings, diabetes,heart, I would find a way) and he is impossible to get supplements into (won't eat food that contains them (we tried multiple joint and "senior" supplements) and it takes two people to get a pill into him.
Vet also is not 100% sure that Dementia is what is going on. He's leaning that way since Dep does not have any physical symptoms (besides weight loss) and has never had a "noticeable" seizure.