I was on 3600 of gabapentin and my doctor recommend I try lyrica. I also started having weight gain--and for me, lyrica did a worse job at helping with pain. So I switched back to gabapentin. I'm now taking a time-release version, called gralise. (There's another time-release version as well, but I don't recall the name.) It's expensive enough that I've wondered if I should even have the insurance company paying for it, but I was feeling the ups and downs of gabapentin three times a day and time-release removes that issue. (And I'm taking 1800mg of the drug so that may help, too.) Lyrica would have to be fantastic for me to go back to it, and it isn't (for me).