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Well, you see rash is a rare but serious side effect of lamotrigine and so it should be immediately reported to your prescribing / treating doctor who would most likely suggest you to stop lamotrigine. You see before too you had not tolerated lamotrigine at 200 mg dose and it was a lesser dose that you have been tolerating and responding well to, so kindly do not waste any more time and just report about this to your doctor by earliest and get it treated.
Kindly see the link below to know more about the serious side effects of lamotrigine, one of which is rash.
I hope this helps.
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