What would be some of the side effects of taking Namenda, if you didn t need to be taking it. My husband was given Namenda for memory problems, but after that we found out he had low testosterone 0.6. He is now on shots for that condition. He has made lots of improvement with his memory, but he is still taking Namenda? He was also on Exelon patches, but when his last prescription ran out, I didn t refill.