my pdoc told me when i gave lamitrogine/lamictal a trial that if the rash was going to happen - it would probably happen within 2 days of starting the drug. he said of course it can develop at any stage, but that the peak time would be when you just started it. so if you're clear after a few days, you don't need to worry about it so much, just be aware that it's a possibility.

lamitrogine is meant to be particularly useful for bipolars who mainly struggle with depression as part of their illness. i did find that it helped a lot in this regard, but eventually i moved on to an anti-depressant which helped more.