Did you start out on 225mgs???? Without titrating up slowly??? Or did you take 25mgs twice a day??? Even that is alot....usually you are to start out at 25mg/day for a few weeks and then titrate up slowly from there.
Wow....if your doctor started you on 225mgs without doing so slowly then I would say that you should find yourself another doctor!!! Lamictal is usually started at 25mgs for a few weeks and then 25mg increases a week at a a time until you are at the dosage you need to be at in order to prevent that SJS rash!!
The rash will get worse so long as the Lamictal is still in your system. I would make sure you continue to take that prednisone meticulously and if you worsen get yourself back to the ER!! I do not want to scare you but what is happening outside your body is happening inside it as well!! This rash can get to the point of almost 2nd to 3rd degree burns and can be fatal so please make sure you take care of yourself.
If the rash is giving you no relief I hear oatmeal baths will help....it's almost as if when it is dry it is pure agony. I never had it but heard of people who did and it is not a pleasant experience.
Please do not hesitate to go back to the hospital if things do not improve. The rash is not something to take lightly and you have every right to be alarmed.
Keep us posted as to how things are going. I wish you well.....my daughter is on Lamictal and has been on it for over a month and only on 25mgs starting at 10mgs since she is very sensitive to other meds and has gotten rashes.
Good luck ~ Goody