Hi! Thanks! I lost a kidney to cancer one year ago... (my DNA shows increased risk to Phenytoin, a similar drug?) ... I've been on 400mg Tegretol per day for about 21 years... in looking at side effects, my wife (with a degree in Psychology & a career in healthcare) both agree that I experience at least 18 of the side effects! I'm increasingly concerned that the Tegretol may affect my other kidney. But my doctor stubbornly refuses to agree that the medication can be harmful to the kidneys. I'm put in the position of having to prove my point. I want off! Would like to titrate to 200, then 100, then off to avoid seizures, etc., with the docs help; but am "ready" to just quit if I can't get cooperation from the doc. So... the question is, is it possible that Tegretol may have been a factor in my kidney cancer... and/or that it may damage the other kidney? Thank you so much!