Paper I
2017 February (2010 Scheme) · 40 marks · 120 min

Question

Lamotrigine

Q43 marksShort Notes

Answer

Lamotrigine is a newer, broad-spectrum antiepileptic drug.

Mechanism of action

  • Blocks voltage-gated sodium channels, stabilizing neuronal membranes and inhibiting the release of excitatory neurotransmitters (glutamate)

Uses

  • Partial seizures, generalized tonic-clonic seizures, absence seizures
  • Bipolar disorder (mood stabilizer, particularly for the depressive phase)
  • Effective and preferred in pregnancy compared to older antiepileptics (relatively lower teratogenic risk, though still requires caution)

Adverse effects

  • Skin rash — can progress to Stevens-Johnson syndrome/toxic epidermal necrolysis, especially with rapid dose titration or co-administration with valproate (requires slow, gradual dose escalation)
  • Dizziness, diplopia, headache
  • Insomnia

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