My side effects are some drowsiness and memory loss, but I've been on it for about 3yrs. and have graduated up to 800mg/5 day. I could'nt deal with the pain if I did'nt have it so I just have to deal with the side effects, mine are'nt as bad as when I first started it takes a while to adjust to it. I take mine for Nerve damage pain, which is very hard to treat anyone know of anything else out there that's helped them?