Lacosamide G.L. (Lacosamide)

Lacosamide is an anticonvulsant indicated for specific seizure types and epilepsy management.

• Partial‑onset seizures: reduces seizure frequency when added to existing therapy.
• Adjunctive therapy for epilepsy: improves overall seizure control in patients with refractory epilepsy.
• Focal epilepsy: provides additional seizure reduction as part of a combination regimen.

• Lacosamide enhances the slow inactivation of voltage‑gated sodium channels, stabilizing neuronal membranes and decreasing hyper‑excitability. By selectively targeting the persistent sodium current, it limits repetitive neuronal firing without affecting normal rapid channel activity, thereby reducing the propagation of epileptic discharges.

Lacosamide may cause a range of adverse reactions, from mild to serious.

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Nausea: mild to moderate stomach upset.
• Fatigue: feeling unusually tired or weak.
• Headache: mild to moderate pain in the head.
• Blurred vision: temporary visual disturbances.
• Diplopia: double vision in some patients.

Serious or Rare Side Effects

• Cardiac arrhythmia: alterations in heart rhythm, especially PR‑interval prolongation.
• Suicidal thoughts: emergence of depressive symptoms or suicidal ideation.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Hepatic injury: signs of liver dysfunction including jaundice.
• Respiratory depression: marked reduction in breathing effort in rare cases.
• Anaphylaxis: acute allergic reaction with potential airway compromise.

Before initiating Lacosamide therapy, consider the following safety measures.

• Renal impairment: monitor renal function and adjust therapy as needed.
• Hepatic impairment: use caution and assess liver enzymes regularly.
• Cardiac conduction disorders: obtain baseline ECG and monitor for PR‑interval changes.
• Pregnancy: risk category unknown; discuss potential benefits and risks with a healthcare professional.
• Concomitant antiepileptic drugs: observe for increased side‑effect burden.
• Store at ambient temperature: keep below 25 °C in the original packaging, protect from moisture and direct sunlight.

Lacosamide can interact with several medications, requiring careful management.

Major Interactions (Avoid)

• Strong CYP3A4 inducers (e.g., carbamazepine, phenytoin): may markedly reduce lacosamide plasma levels.
• Drugs that prolong PR interval (e.g., class IA antiarrhythmics): increase risk of cardiac conduction abnormalities.

Moderate Interactions (Monitor Closely)

• Other antiepileptic drugs (e.g., valproate, phenobarbital): may enhance central nervous system side effects.
• Alcohol: can potentiate dizziness and sedation.
• Digoxin: may raise serum digoxin concentrations, requiring level checks.