Lamotrigine intoxication provoking status epilepticus in an adult with localization-related epilepsy.

BACKGROUND

Various anticonvulsant medications have been associated with paradoxical aggravation of epileptic seizures in therapeutic doses and toxic concentrations. Lamotrigine has been reported to exacerbate seizures and myoclonic seizures in generalized epilepsy in a child with localization-related epilepsy.

OBJECTIVE

To describe lamotrigine intoxication paradoxically producing status epilepticus in an adult with localization-related epilepsy.

DESIGN

Observational case report.

SETTING

Neurology service, inpatient hospitalization, and outpatient follow-up in a neurology clinic.

PATIENT

A patient with known localization-related epilepsy who ingested an overdose of lamotrigine tablets in a suicide attempt.

INTERVENTION

None.

MAIN OUTCOME MEASURE

Observation of the course of the patient's reaction to lamotrigine intoxication, monitoring of lamotrigine levels, and monitoring of ictal and postictal status.

RESULTS

The patient developed a prolonged convulsive status epilepticus, which was eventually controlled with benzodiazepines. The patient also developed transient obtundation and severe ataxia, all of which resolved completely within 96 hours.

CONCLUSIONS

To our knowledge, in addition to being the first case report to describe convulsive status epilepticus after lamotrigine intoxication, this is the first report of the proconvulsant effect of lamotrigine in a case of localization-related epilepsy in an adult. The effects of accidental or suicidal ingestion of lamotrigine tablets seem to be reversible.