Stevens-Johnson Syndrome associated to phenytoin in a Colombian patient with focal convulsive syndrome This is a case report of a female patient with a diagnosis of Stevens-Johnson Syndrome induced by Phenytoin. The patient was admitted to a third level hospital. Thirteen days after she started phenytoin use (prescribed for her focal seizure disorder), she presented some maculo-papular lesions in head and thorax, associated with oral and genital ulcers. Distribution and presentation of lesions, the systemic compromise, associated with the temporary use of Phenytoin, supported the diagnosis of SJS. The diagnosis was confirmed by Dermatology. The patient was treated successfully and she was discharged without complications ten days after her admission. (MED. UIS. 2012;25(2):155-62).