I've had quite a few treatments. The first series was a miracle! It lasted a good long time, too.. I've had some since with not as drastic improvement. I worry about memory. My problem is "word finding" when I'm speaking to someone. That can be so embarrassing. If you can, read the book Shocked by Kitty Dukakis. ,(The former governor of Massachusetts wife,) Its very informative. After I read it I asked the publisher how to contact Kitty. I was so surprised when she called me and answered my questions. I suppose it depends o where you get it and the strength.( Unilateral ultra brief for example. Going under anesthesia isn't bad at all. The staff of wherever you get it can make a big difference.