Treatment of Drug-Induced Leukocytoclastic Vasculitis
Initial Management: Drug Withdrawal
- The American Journal of Kidney Diseases recommends immediate discontinuation of the offending medication as the primary treatment for drug-induced leukocytoclastic vasculitis, which alone is often sufficient to induce prompt resolution without requiring immunosuppressive therapy 1
- Discontinue the causative drug immediately upon clinical suspicion, as this is critical to control the vasculitis and prevent relapses 1
- Common culprit medications include hydralazine, propylthiouracil, levamisole-adulterated cocaine, minocycline, levetiracetam, and warfarin 1
Diagnostic Clues for Drug-Induced Vasculitis
- High-titre MPO ANCA positivity or dual MPO and PR3 ANCA positivity is a distinguishing feature that suggests drug-induced rather than idiopathic vasculitis 1
- Discordance between ANCA type by immunofluorescence versus ELISA is a diagnostic clue for drug-induced vasculitis 1
- Positive ANA and antihistone antibodies are associated with drug-induced vasculitis 1
- In levamisole-induced cases, neutropenia and retiform purpuric rash are characteristic features 1
When to Add Corticosteroids
- The Annals of the Rheumatic Diseases recommends adding systemic corticosteroids only when there are signs of incipient skin necrosis or severe systemic involvement, with a dosage of prednisolone 1 mg/kg/day, max 60 mg/day 2
- The EULAR/KDIGO guidelines do not apply to drug-induced vasculitis, and cyclophosphamide or rituximab should not be used 2, 3, 4