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Lamotrigine Rash – Red Flag Assessment — SCE Neurology MCQ

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ModerateEpilepsy & Seizure DisordersLamotrigine Rash – Red Flag AssessmentSCE Neurology

A 50-year-old man with epilepsy controlled on lamotrigine develops a rash. The rash is a mild, non-progressive maculopapular eruption without mucosal involvement, no fever, and no systemic symptoms. It appeared 10 days after starting lamotrigine. What is the management?

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Correct answer: C — Assess the rash carefully — a mild, non-progressive rash without red flag features (mucosal involvement, blistering, fever, eosinophilia, facial oedema) may be monitored closely with the option to continue lamotrigine cautiously; however, any red flag should prompt immediate cessation

Not all rashes on lamotrigine are SJS/TEN. Mild, non-progressive, non-blistering rashes without systemic features occur in ~10% of patients and often resolve spontaneously. However, distinguishing a benign rash from early SJS/TEN can be challenging. RED FLAGS requiring immediate cessation: mucosal involvement, blistering/skin detachment, fever, facial/lip oedema, lymphadenopathy, eosinophilia, elevated LFTs. If no red flags are present, close monitoring with dermatological input may allow cautious continuation. The decision requires clinical judgement and should err on the side of caution. A: Stopping for all rashes would deny lamotrigine to many patients unnecessarily. C: Dose increases should be paused. D: No rash should be ignored. E: Antihistamines alone are insufficient.

Reference: BNF – Lamotrigine Rash Guidance; BAD SJS/TEN Guidelines