Explaining lamotrigine titration and rash safety (CASC)

Station instructions (candidate)

You have 7 minutes. Explain why lamotrigine fits depression-pole prevention, how you will start it slowly because she is on valproate, how her combined pill affects levels, and which rash symptoms mean stop-and-seek-help. Balance honesty about rare serious rash against the cost of untreated bipolar depression. Do not guarantee zero risk. Do not dismiss fear. Do not invent exact national tablet strengths if unsure — explain principles and that the written schedule follows product guidance.[1][2][3][4]

Marking domains

Agenda setting and empathy; accurate plain-language polarity rationale; explanation of slow titration and why valproate changes the schedule; OCP interaction counselling; clear red-flag rash teaching; collaborative plan with written instructions and review dates; hope without hype grounded in maintenance evidence.[1][2][3][4][5][6]

Model communication map

1. Open: acknowledge fear about Stevens-Johnson syndrome; name shared goals (fewer long depressions, safety).[4]
2. Why this medicine: her pattern is depression-heavy bipolar illness; lamotrigine has evidence for helping prevent depressive return after mood stabilisation — not a quick mania tablet.[1][6]
3. Why so slow: serious rash risk is reduced by starting low and increasing slowly; because valproate raises lamotrigine levels, her schedule will be even more careful than standard.[2][5]
4. The pill: combined contraceptives can lower lamotrigine levels; we account for that and must know if she starts or stops the pill later.[3]
5. Red flags: mouth/eye sores, blistering, peeling, fever with spreading rash → stop the medicine and seek urgent care the same day. Mild spots still deserve a same-day call if she is unsure.[4]
6. Close: written titration card, emergency contacts, next review, questions.[5]

Common fails

• Dismissing SJS as "internet nonsense" without a safety plan.[4]
• Using a fast load because "she is depressed now."[5]
• Ignoring valproate or the OCP.[2][3]
• Promising cure or zero rash risk.[1][4]
• Forgetting written instructions and follow-up.[5]