Lamotrigine Sandoz (Lamotrigine)

Lamotrigine is an antiepileptic drug used to manage seizure disorders and mood stabilization. It is indicated for several neurological and psychiatric conditions.

• Epilepsy: reduces the frequency and severity of partial and generalized seizures.
• Bipolar disorder: helps prevent mood swings and depressive episodes.
• Adjunct therapy for refractory seizures: used when other antiepileptic drugs are insufficient.

• Lamotrigine inhibits voltage‑gated sodium channels, which stabilizes neuronal membranes and diminishes the release of excitatory neurotransmitters such as glutamate. This action reduces neuronal hyperexcitability, contributing to seizure control and mood stabilization.

Lamotrigine may cause a range of adverse reactions, from mild to severe. Patients should be aware of both common and rare side effects.

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Headache: mild to moderate pain in the head region.
• Nausea: feeling of stomach upset or urge to vomit.
• Rash: skin irritation that may be itchy or red.
• Blurred vision: temporary visual disturbances.
• Fatigue: unusual tiredness or lack of energy.

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 cell counts, such as leukopenia.
• Severe hepatic failure: marked liver dysfunction.
• Agranulocytosis: critically low white blood cell count.
• Anaphylaxis: acute allergic reaction with potential airway compromise.

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

• Renal function: assess and adjust if impairment is present.
• Hepatic function: monitor liver enzymes regularly.
• Concomitant valproate: anticipate increased lamotrigine plasma levels.
• Pregnancy: discuss potential risks as data are limited.
• Skin reactions: discontinue immediately if a rash develops.
• Store at ambient temperature: keep in the original pack, protect from moisture.

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

Major Interactions (Avoid)

• Valproic acid: may raise lamotrigine levels, increasing risk of toxicity.
• Carbamazepine: can lower lamotrigine concentrations, reducing efficacy.
• Oral contraceptives: may decrease lamotrigine levels, requiring dose adjustment.
• Enzyme inducers (phenytoin, phenobarbital): accelerate lamotrigine metabolism.

Moderate Interactions (Monitor Closely)

• NSAIDs: may modestly increase lamotrigine exposure.
• Antidepressants (SSRIs): monitor for additive central nervous system effects.
• Alcohol: can enhance dizziness and sedation.