I have been taking tegretol xr 400mg/2xday for several years for seizures and recently lost my insurance. Now I have been changed to plain tegretol 400mg/2xday... shouldn't I be taking this 4 times a day instead of twice a day? I was originally put on the "XR" because I had seizures anytime I became to "toxic" ... I have to say, I am very afraid and the doctor I have now isn't listening.