Switching from Lamotrigine to Ethosuximide for Absence Seizures

Cross-Titration Protocol

• Gradually reduce lamotrigine over 2-4 weeks while simultaneously initiating ethosuximide, as recommended by the American Society of Clinical Oncology 1
• Lamotrigine requires several weeks to reach sufficient drug levels when initiating, but tapering can proceed more rapidly, according to the American Society of Clinical Oncology 2, 1

Monitoring During Transition

• Plasma ethosuximide concentrations can be measured to optimize dosing, though routine monitoring is not mandatory, as suggested by the National Institute of Health 3
• The most common side effects of ethosuximide include mild transient nausea, dizziness, somnolence, and headache, as reported by the National Institute of Health 4