DR9.4 | Lepra Reaction Treatment — Summary & Reflection

KEY TAKEAWAYS

Lepra reactions are acute immunological episodes and the chief cause of leprosy nerve damage, so prompt recognition and correct treatment are emergencies. Type 1 (reversal reaction) is a T-cell-mediated, Type IV (delayed) hypersensitivity event occurring in borderline patients (BT, BB, BL); it inflames the patient's EXISTING lesions and causes acute neuritis, and is treated with corticosteroids (prednisolone ~40 mg/day, tapered over ~12 weeks), started urgently when nerve function is failing. Type 2 (erythema nodosum leprosum, ENL) is an immune-complex-mediated, Type III event occurring in lepromatous patients (BL, LL); it produces crops of NEW tender nodules with systemic features (fever, iritis, arthritis, orchitis) and is treated with corticosteroids plus clofazimine or thalidomide. Two critical safeguards: clofazimine's anti-ENL dose is 300 mg/day (distinct from the 50 mg/day MDT dose), and thalidomide is absolutely contraindicated in women of childbearing age because it is a teratogen. Across BOTH reaction types, multidrug therapy is continued, never stopped — a reaction is an immune event, not antibiotic failure. Distinguishing the two reactions and choosing the right drug is the skill that preserves a patient's nerves, eyes, and limbs.

REFLECT

Return to the two patients from the opening scenario — the borderline man whose nerve you can still save with prompt corticosteroids, and the young woman with recurrent ENL for whom thalidomide, the most effective drug, is forbidden. Reflect on how dangerous it would be to treat them as interchangeable, and on the mental checklist you will run whenever a leprosy patient 'flares': which reaction, which mechanism, which drug, which dose, is thalidomide off the table, and is MDT still running? Consider too the human stakes behind the dose trap — confusing clofazimine's 50 mg and 300 mg roles, or letting thalidomide reach a woman who could conceive, are errors with permanent consequences. As you build this skill, resolve that the discipline of distinguishing the two reactions will be automatic the next time minutes matter and a patient's nerve is failing in front of you.