Related Experiment Video
Updated: Aug 14, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
Published on: April 5, 2011
Stupor from lamotrigine toxicity
1Department of Neurology, University of Utah School of Medicine, Salt Lake City, Utah, USA.
Purpose:
To report that acute lamotrigine poisoning may result in severe encephalopathy.
Methods:
A 55-year-old woman became stuporous after overdose with lamotrigine (LTG) and valproic acid (VPA) tablets. Evaluation revealed elevated serum LTG levels and no other etiology for encephalopathy.
Results:
LTG was withheld, and the patient experienced a complete recovery in conjunction with reduced serum levels.
Conclusions:
LTG overdose may result in a severe but reversible encephalopathy, a previously undescribed phenomenon. LTG toxicity should be considered in patients taking this drug who have depressed mental status.
Related Concept Videos
Mania and Antimanic Drugs: Overview
Antiepileptic Drugs: Glutamate Antagonists
Antiepileptic Drugs: Potassium Channel Activators
Ezogabine has gained approval as an adjunctive treatment...
Drug Toxicity: Overview
Drug Toxicity: Dose-Dependent Reactions
Drug toxicity: Idiosyncratic Reactions

