How common are benign and serious rashes with lamotrigine?

Patients rightfully want to know and should be told the chances of having a serious allergic reaction that is accompanied by a skin rash, i.e., Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN). What do you tell your patients? What is the percentage chance of a “serious rash”? But, while patients must take any new onset…