Lamotrigine Teva (Lamotrigine)

Lamotrigine is an anticonvulsant that acts on neuronal sodium channels to control seizure activity and stabilize mood.

• Epilepsy: reduces the frequency and severity of both generalized and focal seizures.
• Bipolar disorder: helps prevent recurrence of depressive and manic episodes as maintenance therapy.
• Generalized tonic‑clonic seizures: controls seizure spread and reduces convulsive episodes.
• Partial seizures: diminishes focal seizure occurrence and improves neurological stability.

• Lamotrigine stabilizes neuronal membranes by selectively inhibiting voltage‑gated sodium channels, which limits the release of excitatory neurotransmitters such as glutamate. This reduction in neuronal firing dampens the propagation of epileptic discharges and contributes to mood stabilization in bipolar disorder by modulating synaptic transmission. Additionally, lamotrigine may affect calcium channels and inhibit the release of aspartate, further contributing to its antiepileptic profile.

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

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Headache: mild to moderate cranial pain.
• Nausea: feeling of stomach upset, sometimes with vomiting.
• Rash: skin redness or mild eruption.
• Blurred vision: temporary visual disturbances.
• Fatigue: general tiredness or lack of energy.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction with blistering and mucosal involvement.
• Toxic epidermal necrolysis: life‑threatening skin detachment.
• Blood dyscrasias: including agranulocytosis or aplastic anemia.
• Hepatic failure: significant liver enzyme elevation and dysfunction.
• Suicidal thoughts: emergence of depressive or suicidal ideation.
• Severe skin reactions: such as drug reaction with eosinophilia and systemic symptoms (DRESS).

When prescribing lamotrigine, clinicians should observe several precautionary measures to ensure safe use.

• Assess hepatic function: evaluate liver status before initiation and monitor periodically.
• Adjust for renal impairment: consider dose modification in patients with reduced kidney function.
• Avoid abrupt discontinuation: sudden stop may precipitate seizure recurrence.
• Use caution in pregnancy: limited data; benefits must outweigh potential risks.
• Monitor for skin reactions: educate patients to report rash promptly.
• Store at room temperature: keep in original packaging, protect from moisture and light.

Lamotrigine's plasma concentrations can be altered by several concomitant medicines, requiring dose adjustments or monitoring.

Major Interactions (Avoid)

• Valproic acid: markedly increases lamotrigine levels, raising toxicity risk.
• Carbamazepine: significantly reduces lamotrigine concentrations, potentially decreasing efficacy.
• Phenobarbital: lowers lamotrigine exposure, may require dose increase.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: increase lamotrigine clearance, possibly reducing effectiveness.
• Serotonergic agents: may heighten risk of serotonin syndrome; monitor symptoms.
• Other antiepileptics (phenytoin, primidone): can affect lamotrigine metabolism, requiring careful level assessment.