Lamictal (Lamotrigine)

Lamotrigine is used in neurological and psychiatric conditions that involve abnormal neuronal excitability.

• Epilepsy: reduces the frequency and severity of seizures.
• Bipolar disorder: stabilises mood and helps prevent depressive episodes.

• Lamotrigine inhibits voltage‑gated sodium channels, which stabilises neuronal membranes and diminishes the release of excitatory neurotransmitters such as glutamate. This modulation of neuronal firing underlies its antiepileptic and mood‑stabilising effects.

Lamotrigine may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Dizziness: transient light‑headedness or loss of balance.
• Headache: mild to moderate pain often relieved with rest.
• Nausea: upset stomach, sometimes with vomiting.
• Rash: skin redness or itching, usually mild.
• Blurred vision: temporary visual disturbances.
• Fatigue: feeling unusually tired.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction requiring immediate medical attention.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Blood dyscrasias: abnormal blood counts such as agranulocytosis.
• Hepatic failure: impaired liver function.
• Severe skin reactions: including drug reaction with eosinophilia and systemic symptoms (DRESS).
• Anaphylaxis: rare but potentially fatal allergic response.

Before initiating lamotrigine therapy, consider the following safety measures.

• Pregnancy: safety unknown; discuss risks with a healthcare professional.
• Renal impairment: dose may need adjustment based on kidney function.
• History of skin reactions: avoid if previous severe rash occurred.
• Concomitant valproate: increased risk of serious skin reactions; monitor closely.
• Discontinuation: do not stop abruptly to prevent seizure worsening.
• Store at ambient temperature: keep in the original pack, protect from moisture.

Lamotrigine interacts with several medicines that can alter its effectiveness or safety.

Major Interactions (Avoid)

• Valproic acid: markedly increases risk of severe skin reactions.
• Carbamazepine: reduces lamotrigine plasma concentrations, decreasing efficacy.
• Phenobarbital: lowers lamotrigine levels, potentially compromising seizure control.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: increase lamotrigine clearance, possibly requiring dose adjustment.
• Serotonergic agents: may raise the risk of serotonin syndrome.
• Other antiepileptics: combined use may necessitate careful dose titration and monitoring.