epilepsy
"Made me incredibly ill for first couple of weeks.  Nothing else worked.  But this did.  No more grand mals.  Seizure free, so long as I take the prescribed dose.  There is the risk [blood tests a must for safety] and I take the max dose, so I take 6 600mg tablets a day and I am only 26/Female, so that can be annoying, but you got to do what you got to do.  I also take vitamin supplements."