Lamotrigina Teva (Lamotrigine)

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

• Partial seizures: decreases frequency of focal seizures.
• Generalized tonic‑clonic seizures: reduces occurrence of convulsive seizures.
• Bipolar disorder (maintenance): helps maintain mood stability and prevent relapse.

• Lamotrigine inhibits voltage‑gated sodium channels in neuronal membranes, preferentially stabilizing the inactive state of the channel. This reduces the rapid influx of sodium ions during depolarization, limiting repetitive neuronal firing. The drug also diminishes release of excitatory neurotransmitters such as glutamate, contributing to its antiepileptic and mood‑stabilising effects. By modulating these pathways, lamotrigine lowers neuronal hyperexcitability without significant impact on cardiac conduction or hormonal systems.

Lamotrigine may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Rash: mild skin irritation or erythema.
• Headache: transient cranial pain.
• Dizziness: sensation of light‑headedness.
• Nausea: mild gastrointestinal upset.
• Fatigue: feeling of tiredness or reduced energy.
• Tremor: fine shaking of hands or limbs.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction with blistering.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Aseptic meningitis: inflammation of meninges without infection.
• Hematologic abnormalities: such as agranulocytosis or aplastic anemia.
• Hepatic failure: severe liver injury.
• Suicidal ideation: emergence of thoughts of self‑harm.

When prescribing lamotrigine, several safety considerations are recommended.

• Initiate therapy: start at low dose and titrate slowly to reduce rash risk.
• Monitor skin: discontinue immediately if a rash develops.
• Assess hepatic function: use caution in patients with liver impairment.
• Review psychiatric history: monitor for mood changes or suicidal thoughts.
• Avoid abrupt discontinuation: taper dose to prevent seizure recurrence.
• Store at ambient temperature: keep below 25°C in original container, protect from moisture.

Lamotrigine interacts with several medicines; clinicians should evaluate potential effects.

Major Interactions (Avoid)

• Valproic acid: markedly increases lamotrigine plasma levels, risk of toxicity.
• Carbamazepine, phenytoin, phenobarbital: reduce lamotrigine concentrations, may diminish efficacy.
• Oral contraceptives: estrogen‑containing pills lower lamotrigine levels, may require dose adjustment.

Moderate Interactions (Monitor Closely)

• Serotonergic agents: potential for increased serotonergic effects.
• Other antiepileptic drugs (e.g., levetiracetam): may require therapeutic monitoring.
• Antacids containing aluminum or magnesium: may slightly decrease absorption.