RT Journal Article SR Electronic T1 Mepolizumab rescue therapy for acute pneumonitis secondary to DRESS JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e231355 DO 10.1136/bcr-2019-231355 VO 12 IS 10 A1 Thein, Onn Shaun A1 Sutton, Benjamin A1 Thickett, David R A1 Parekh, Dhruv YR 2019 UL http://casereports.bmj.com/content/12/10/e231355.abstract AB Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome represents a severe adverse drug reaction driven by eosinophilia. Treatment is focused on withdrawal of medication, supportive care and immunosuppression such as high-dose corticosteroid therapy. Here we report a 56-year-old male patient who initially presented with breathlessness and eosinophilia, subsequent development of respiratory failure and admission to ITU for non-invasive ventilation. The patient continued to deteriorate despite high-dose prednisolone and methylprednisolone. Other causes of hypereosinophilia were normal. He was diagnosed with DRESS syndrome secondary to pregabalin and was treated with subcutaneous mepolizumab. We observed the rapid resolution of eosinophilia and clinical improvement; the patient was discharged home within a month of administration. This represents the successful use of mepolizumab in the acute setting of pulmonary failure secondary to DRESS. A similar approach could be adopted in other acute conditions with refractory eosinophilic inflammation where standard steroid therapy has failed.