Should not be used to treat acute asthma exacerbations. Asthma-related adverse symptoms or exacerbations may occur. Abrupt discontinuation of corticosteroids after initiation of Nucala therapy is not recommended. Risk of acute & delayed systemic reactions, including hypersensitivity reactions. Patients w/ pre-existing helminth infections should be treated before treatment initiation. Has not been studied in patients w/ organ- or life-threatening manifestations of EGPA & in patients w/ life-threatening manifestations of HES. Avoid use during pregnancy. Discontinue breast-feeding or discontinue Nucala therapy. Severe eosinophilic asthma: Safety & efficacy have not yet been established in childn <12 yr. CRSwNP/EGPA/HES: Safety & efficacy have not yet been established in childn <18 yr.