Lacosamid Amarox (Lacosamide)

• Lacosamide is an antiepileptic drug that modulates neuronal excitability in focal seizure disorders.
• Partial‑onset seizures (focal seizures): reduces seizure frequency when added to existing antiepileptic therapy.
• Epilepsy adjunct therapy: used in combination with other seizure‑control medicines to improve overall seizure management.
• Focal seizures with secondary generalisation: helps limit spread of seizure activity and improve patient stability.

• Lacosamide enhances the slow inactivation of voltage‑gated sodium channels in neuronal membranes, stabilising hyper‑excitable neuronal membranes and decreasing repetitive firing. By selectively targeting the slow inactivation phase, it reduces neuronal hyperexcitability without markedly affecting normal conduction, thereby contributing to seizure control in focal epilepsy.

Lacosamide may cause a range of adverse reactions, which are categorised by frequency and severity.

Common Side Effects

• Dizziness: sensation of light‑headedness or imbalance.
• Nausea: mild to moderate stomach upset.
• Fatigue: feeling unusually tired or weak.
• Headache: mild to moderate pain in the head.
• Diplopia: transient double vision.
• Somnolence: increased sleepiness.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, especially PR‑interval prolongation.
• Suicidal ideation: thoughts of self‑harm requiring immediate evaluation.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Elevated liver enzymes: indicating possible hepatic stress.
• Respiratory depression: reduced breathing effort in vulnerable patients.
• Anaphylaxis: rare severe allergic response requiring emergency care.

• When prescribing Lacosamide, clinicians should consider several safety aspects.
• Renal impairment: monitor renal function and adjust therapy as needed.
• Pregnancy and lactation: safety data are limited; use only if benefits outweigh risks.
• Cardiac conduction disorders: evaluate ECG for PR‑interval changes before initiation.
• Concomitant antiepileptic drugs: assess for additive CNS effects and adjust dosing.
• Avoid abrupt discontinuation: taper gradually to prevent seizure worsening.
• Store at room temperature: keep in the original container, protect from moisture and light.

Lacosamide can interact with other medicines, influencing its efficacy and safety.

Major Interactions (Avoid)

• Strong CYP3A4 inhibitors: may increase lacosamide plasma concentrations.
• Co‑administration with other sodium‑channel blockers: heightened risk of cardiac conduction effects.
• Drugs that prolong PR interval: combined use can exacerbate arrhythmias.

Moderate Interactions (Monitor Closely)

• Other antiepileptic drugs: may require dose adjustments to maintain seizure control.
• Oral contraceptives: lacosamide may reduce hormonal contraceptive effectiveness.
• Alcohol: can enhance CNS depression, warranting caution.