I had been ultra rapid cycling in my bipolar. My pdoc got approval to try memantine, normally prescribed as a memory drug but doesn't seem to work well in that category, but he prescribed it as a mood stabilizer for me. I have now been stable for 3 months. I have never before experienced stability in my life like this. He said memantine acts on the same brain areas? teceptors? that ketamine does. Has anyone else tried memantine? I take other psych meds too. This was the most recent addition and unbelievably its working for me.