Little is known about the efficacy and safety of the anti-interleukin 5 monoclonal antibody mepolizumab (MPZ) in patients with eosinophilic granulomatosis with polyangiitis (EGPA) in real-life. We thus evaluated disease activity, damage and disease-related complications in 14 patients with EGPA receiving MPZ for refractory disease for a median time of 16 months in comparison with up to five years before MPZ start. Asthma exacerbation rates, the Birmingham Vasculitis Activity Score and corticosteroid dosage decreased during MPZ (p