A meta-analysis of four studies found that lacosamide, a sodium channel modulator, provided pain relief in 66.7% of adults with trigeminal neuralgia, with adverse events occurring in 35.2% of patients, most commonly sleepiness and dizziness.
- Lacosamide achieved pain relief in two-thirds of trigeminal neuralgia patients across four studies
- Side effects occurred in about one-third of patients but were generally mild and temporary
- Intravenous lacosamide showed promise for acute pain episodes, with 77.8% achieving pain absence within 10 hours
How this compares to prior research
Trigeminal neuralgia is typically treated with first-line medications like carbamazepine, but many patients experience inadequate pain control or cannot tolerate side effects. Lacosamide represents a newer approach targeting slow-inactivated sodium channels, a different mechanism than traditional treatments. Prior to this meta-analysis, evidence for lacosamide\’s effectiveness in trigeminal neuralgia came only from individual observational studies without pooled quantitative analysis.
Trigeminal neuralgia prevalence trends, global population, 1980–1989
Key findings
- 66.7% of patients with trigeminal neuralgia experienced pain relief with oral lacosamide treatment
- 35.2% of patients experienced adverse events, with sleepiness (24.6%) and dizziness (21.7%) being most common
- Intravenous lacosamide resulted in 77.8% of patients reporting pain absence within 10 hours during acute exacerbations
What this means in practice
- Ask your neurologist about lacosamide if standard trigeminal neuralgia medications haven\’t worked or caused intolerable side effects
- Consider intravenous lacosamide for severe acute pain episodes, as it may provide relief within 10 hours
- Monitor for sleepiness and dizziness when starting lacosamide, as these are the most common side effects
Frequently asked questions
What is lacosamide and how does it work for trigeminal neuralgia?
Lacosamide is a medication that selectively enhances slow inactivation of voltage-gated sodium channels. It may help reduce the severe facial pain characteristic of trigeminal neuralgia by modulating nerve signal transmission.
What are the most common side effects of lacosamide?
The most frequent side effects are sleepiness (24.6% of patients) and dizziness (21.7%). Other less common effects include instability, heart rhythm changes, and inattention. Most side effects were mild and temporary.
Is lacosamide a first-line treatment for trigeminal neuralgia?
No, lacosamide is considered an alternative therapy, particularly for patients who don\’t respond to or can\’t tolerate standard first-line medications. More research through randomized trials is needed to establish its role.
Key terms explained
Trigeminal neuralgia
A chronic pain condition affecting the trigeminal nerve in the face, causing sudden, severe facial pain often triggered by touch or movement.
Voltage-gated sodium channels
Proteins in nerve cells that control electrical signals by allowing sodium ions to pass through, playing a key role in pain transmission.
Meta-analysis
A statistical method that combines results from multiple studies to provide a more precise estimate of treatment effects than individual studies alone.
Source: Slow-inactivated sodium channels as a therapeutic target in trigeminal neuralgia: evidence from a systematic review and meta-analysis of lacosamide. · DOI: doi: 10.22514/jofph.2026.037
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