Lamotrigine Teva (Lamotrigine)

Lamotrigine is an anticonvulsant that modulates neuronal excitability in seizure disorders and mood stabilization.

• Epilepsy: reduces the frequency of partial and generalized seizures.
• Bipolar disorder: maintains mood stability and helps prevent depressive episodes.
• Lennox‑Gastaut syndrome (adjunct therapy): decreases overall seizure burden in this severe childhood epilepsy.

• Lamotrigine inhibits voltage‑gated sodium channels, stabilizing neuronal membranes and decreasing excessive neuronal firing. This action reduces the release of excitatory neurotransmitters such as glutamate, thereby lowering seizure activity and contributing to mood stabilization in bipolar disorder.

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

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Headache: mild to moderate cranial pain.
• Nausea: upset stomach, sometimes with vomiting.
• Rash: skin irritation that may be itchy.
• Blurred vision: temporary visual disturbances.
• Insomnia: difficulty falling or staying asleep.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction requiring immediate medical attention.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Blood dyscrasias: such as agranulocytosis or aplastic anemia.
• Hepatic failure: signs of liver dysfunction.
• Suicidal thoughts: emergence of depressive or suicidal ideation.
• Severe hypersensitivity: anaphylaxis or angioedema.

When prescribing lamotrigine, clinicians should consider several safety measures.

• Monitor serum levels: adjust dose when co‑administered with enzyme‑inducing or inhibiting drugs.
• Avoid abrupt discontinuation: sudden stop may precipitate seizure recurrence.
• Use caution in hepatic impairment: impaired metabolism may require dose modification.
• Pregnancy: limited data; benefits must be weighed against potential fetal risk.
• Store at ambient temperature: keep in the original pack, protect from moisture.

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

Major Interactions (Avoid)

• Valproic acid: markedly raises lamotrigine levels, increasing risk of severe skin reactions.
• Carbamazepine: lowers lamotrigine levels, potentially reducing therapeutic effect.
• Phenobarbital: reduces lamotrigine concentrations, risking loss of seizure control.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: may decrease lamotrigine levels, requiring dose adjustment.
• Rifampin: induces metabolism, lowering lamotrigine exposure.
• Serotonergic agents (e.g., SSRIs): monitor for signs of serotonin syndrome.