Here is the black box warning from Lamictal:
"Hypersensitivity reactions: Hypersensitivity reactions, some fatal or life-threatening, have also occurred. Some of these reactions have included clinical features of multiorgan dysfunction such as hepatic [liver] abnormalities and evidence of disseminated intravascular coagulation [formation of small blood clots throughout the body]. It is important to note that early manifestations of hypersensitivity (e.g., fever, lymphadenopathy [swelling of lymph nodes]) may be present even though a rash is not evident. If such signs or symptoms are present, the patient should be evaluated immediately. LAMICTAL® should be discontinued if an alternative etiology [cause] for the signs or symptoms cannot be established."