Abstract
A 75-year-old man presented to our hospital with chronic sinusitis, bronchiectasis, and chronic lower respiratory tract infections. He began taking erythromycin in August, X-2. The chronic lower respiratory tract infection gradually worsened, and clarithromycin was started on May 11, X. He became aware of fever and numbness in his lower legs on June 4, X. The sign occurred soon after oral clarithromycin and blood tests showed an elevated eosinophil count and C-reactive protein (CRP) levels, positive MPO-ANCA antibodies, and positive for drug-induced lymphocyte stimulation test (DLST); we diagnosed eosinophilic granulomatosis with polyangiitis (EGPA) associated with clarithromycin administration.