About 3 weeks I‘d say. Maybe a bit more or less . It’s really hard to remember but I do know it was a couple of weeks or so. But once it started to really work it was recognizable at once. I could feel a difference quite readily.

I still got/get Allodynia, but I was amazed at how much the Namenda took away. I also still have many other types of "pain" and PN symptoms. Unfortunately there has not been any medicine to help all of my symptoms a lot. Instead, I have a lot of medicines that help a little, and Namenda that does a decent job on the Allodynia - especially for recovery. That was the most beneficial to me. Because like said before, it used to be that when my pain got high it stayed high until I fell asleep, now if it will recede.

I never read up on it once I got the presciption; I didn't want to bias myself in any way. I just waited for the results and since they were positive I never looked into it. So you have found out that others did not have a very positive experience? I am so sorry about that ... It has really helped me for this sort of pain. Well good luck