Combination Therapy with Lamotrigine and Levetiracetam

Introduction to Combination Therapy

• The American College of Neurology recommends that lamotrigine and levetiracetam can be safely taken together, as they are both non-enzyme-inducing antiepileptic drugs that do not have significant pharmacokinetic interactions with each other 1

Pharmacokinetic Interactions

• Both levetiracetam and lamotrigine are classified as non-enzyme-inducing antiepileptic drugs (non-EIAEDs), which reduces the risk of drug interactions 1
• Driving performance studies show no clinically meaningful impairment with continued administration of either drug, according to the National Comprehensive Cancer Network 2

Efficacy and Safety

• Post-hoc analysis of studies suggests that the combination of levetiracetam and lamotrigine is generally well tolerated, with somnolence, dizziness, and fatigue being the most frequently reported adverse events for both drugs 2
• The combination may be particularly useful for patients with focal epilepsy, as it offers a beneficial pharmacodynamic interaction between the two medications 2

Dosing and Monitoring

• Lamotrigine requires slow titration to minimize the risk of serious rash, and its levels will significantly increase if valproate is added to the combination, requiring dose reduction 3
• Initial titration periods may have different side effect profiles, and individual patient responses may vary, so monitoring for efficacy and side effects remains important 3

Special Considerations

• If valproate is added to the combination, lamotrigine dose reduction is necessary due to inhibition of glucuronidation, which increases lamotrigine levels 3
• Driving ability may be temporarily affected during initial titration, particularly with higher doses, according to the National Comprehensive Cancer Network 2