I have had chronic headaches, L sided for over 40 years.  My first headache was daily for 1 1/2  yrs - shooting pains on L side up back of neck over top of head.  What followed was very typical migraine, and I have been to so many docs, headache clinics and on so many medications I am afraid to try new ones now because as I get older I just don't bounce back from these meds like I used to.

My pain doc wants to try me on Namenda, delvelped for moderate to severe Alzheimer's patients to improve memory.  I know there have been headache pain relieg studies done but cannot find them in my research.  I am reluctant to take this medicine - the side effects are quite bad, including headaches, and I now go into rebound headaches so quickly from most medicines that I won't risk all that pain.  I spend at least 2 weeks in bed every month unable to function, and sometimes more.  Headaches come every week to 10 days, often only 2 - 3 days apart.  Can you give me information on this medication for pain use?