Our analysis showed that carbamazepine and phenytoin are still the major causes of AHS, with lamotrigine being the third etiologic agent. Valproic acid and benzodiazepines are safe alternatives of the causative anticonvulsants. As there are yet no strict diagnostic criteria, the constellation of clinical and laboratory features that occur within 3 months of the associated anticonvulsant agents helps to recognize the disorder. The risk of seizure due to withdrawal or changing of the anticonvulsant drug and the potentially serious clinical features often necessitates providing care and treatment in an inpatient setting.