Permanently discontinue use in the event of a hypersensitivity reaction. Do not inj into areas w/ tender, bruised, erythematous, or hardened skin. Should not be used to treat acute asthma exacerbations. Abrupt discontinuation of corticosteroids after initiation of Fasenra therapy is not recommended. Patients w/ pre-existing helminth infections should be treated before initiating therapy w/ benralizumab. Has not been studied in patients w/ active organ-threatening or life-threatening manifestations of EGPA. Preferable to avoid use during pregnancy. Discontinue breast-feeding or discontinue/abstain from Fasenra therapy. Safety & efficacy have not been established in childn & adolescents 6-17 yr w/ asthma; childn <6 yr w/ asthma; childn & adolescents <18 yr w/ EGPA.