Lamictal (Lamotrigine)

Lamotrigine is used across several neurological and psychiatric disease pathways, providing seizure control and mood stabilization.

• Epilepsy: reduces the frequency and severity of partial and generalized seizures.
• Bipolar disorder: helps maintain mood stability and prevents depressive and manic episodes.
• Migraine prophylaxis: decreases the number of migraine attacks when used as preventive therapy.

• Lamotrigine inhibits voltage‑gated sodium channels, which stabilises neuronal membranes and limits the release of excitatory neurotransmitters such as glutamate. By reducing neuronal hyperexcitability, it diminishes the propagation of seizure activity and modulates mood‑related pathways in the central nervous system.

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

Common Side Effects

• Dizziness: transient light‑headedness, especially after dose changes.
• Headache: mild to moderate intensity, often resolves with continued therapy.
• Nausea: occasional stomach upset, usually early in treatment.
• Rash: mild skin irritation or erythema.
• Blurred vision: temporary visual disturbances.
• Insomnia: difficulty falling or staying asleep.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin blistering requiring immediate medical attention.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Blood dyscrasias: agranulocytosis or aplastic anemia.
• Severe hepatic injury: marked elevation of liver enzymes.
• Suicidal thoughts: emergence or worsening of depressive symptoms.
• Anaphylaxis: rare systemic allergic reaction.

Before initiating lamotrigine therapy, several safety considerations should be reviewed.

• Skin monitoring: inspect for rash or hypersensitivity reactions, especially during titration.
• Liver function: assess baseline hepatic enzymes and monitor periodically.
• Renal impairment: adjust dosing in patients with reduced clearance.
• Concomitant valproate: avoid rapid dose escalation due to increased lamotrigine levels.
• Pregnancy counseling: discuss potential risks and benefits with the prescriber.
• Store at ambient temperature: keep below 25 °C, retain in original packaging, protect from moisture and direct sunlight.

Lamotrigine interacts with several medications that can alter its plasma concentration or increase toxicity.

Major Interactions (Avoid)

• Valproic acid: markedly raises lamotrigine levels, risking severe rash.
• Carbamazepine: reduces lamotrigine exposure, potentially compromising efficacy.
• Phenytoin: lowers lamotrigine concentrations, may require dose adjustment.
• Oral contraceptives: increase lamotrigine clearance, possibly reducing effectiveness.
• Phenobarbital: accelerates lamotrigine metabolism, necessitating higher doses.

Moderate Interactions (Monitor Closely)

• Other antiepileptics (e.g., levetiracetam): may require therapeutic monitoring.
• Serotonergic agents: watch for additive central nervous system effects.
• NSAIDs: occasional reports of increased skin reaction risk.