Memantine
"Both of my parents suffer (ed) from Alzheimer's.  My mother died last summer, 8 years after her diagnosis and never took any medication except for Lorazapam.  My Dad was diagnosed with Alzheimer's 6 months ago
 He began taking Ariecpt in November and Mamantadine in December. In five moths he has degenerated so rapidly that he is functioning at the same level as my mom was at in her last year of the disease. Every time the dose is increased he gets exponentially worse its noticeable almost daily.  I am in the process of titration him off both. I wish I would have research it better. I thought that was the doctors job. This is the first online review I have written. Grateful to hear that I'm not imagining these side effects. Thanks"