Lamotrigine Milpharm (Lamotrigine)

Lamotrigine is an antiepileptic drug that acts on neuronal excitability and mood regulation pathways.

• Epilepsy: helps control partial and generalized seizures, reducing seizure frequency.
• Bipolar disorder: contributes to mood stabilization, decreasing the risk of depressive and manic episodes.

• Lamotrigine inhibits voltage‑gated sodium channels, which stabilizes neuronal membranes and diminishes excessive neuronal firing. By reducing sodium influx, it also lowers glutamate release, thereby decreasing excitatory neurotransmission that contributes to seizure activity and mood swings.

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

Common Side Effects

• Headache: mild to moderate pain often reported.
• Dizziness: transient sensation of light‑headedness.
• Nausea: occasional stomach upset.
• Rash: mild skin irritation or erythema.
• Insomnia: difficulty falling or staying asleep.
• Fatigue: general feeling of tiredness.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction requiring immediate medical attention.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Aseptic meningitis: inflammation of the meninges without infection.
• Hematologic abnormalities: such as leukopenia or thrombocytopenia.
• Hepatotoxicity: liver enzyme elevations or injury.
• Suicidal ideation: emergence of thoughts of self‑harm.

Lamotrigine requires careful monitoring due to its safety profile.

• Pregnancy: category D; discuss risks with a healthcare professional before use.
• Breastfeeding: consider potential infant exposure; consult a physician.
• Renal impairment: dose adjustment may be needed; monitor kidney function.
• Hepatic impairment: use with caution; monitor liver enzymes.
• Concomitant valproate: increased risk of severe skin reactions; avoid if possible.
• Store at ambient temperature: keep below 25°C, retain in original packaging, protect from moisture.

Lamotrigine interacts with several medicines that can alter its plasma levels or increase toxicity.

Major Interactions (Avoid)

• Valproate: markedly raises lamotrigine concentrations, heightening rash risk.
• Carbamazepine: reduces lamotrigine levels, potentially decreasing efficacy.
• Oral contraceptives: lower lamotrigine exposure, may require dose adjustment.

Moderate Interactions (Monitor Closely)

• Other antiepileptics (e.g., phenytoin, phenobarbital): may affect lamotrigine metabolism.
• Serotonergic agents (e.g., SSRIs, SNRIs): monitor for increased serotonergic side effects.
• Rifampin: may decrease lamotrigine levels through enzyme induction.