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Monoclonal antibody
TypeWhole antibody
SourceHumanized (from mouse)
Clinical data
Trade namesFasenra
Routes of
Subcutaneous injection
ATC code
Legal status
Legal status
CAS Number
  • none
Chemical and physical data
Molar mass146.0 kg/mol g·mol−1
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Benralizumab (INN, trade name Fasenra) is a monoclonal antibody which developed by MedImmune for the treatment of asthma. It is directed against the alpha-chain of the interleukin-5 receptor (CD125).[1][2]

Two Phase 3 clinical trials of benralizumab, SIROCCO and CALIMA, reported meeting their primary endpoints in 2016.[3][4] It was approved by the US FDA in November 2017 for the treatment of severe eosinophilic asthma.[5] It was also granted orphan drug designation by the FDA for treatment of eosinophilic oesophagitis in August 2019.[6]


  1. ^ Statement on an Nonproprietary Name adopted by the USAN Counil: Benralizumab
  2. ^ Catley MC (September 2010). "Asthma & COPD--IQPC's Second Conference". IDrugs. 13 (9): 601–4. PMID 20799138.
  3. ^ AstraZeneca's benralizumab reduces asthma exacerbations up to 51% in two late-state studies. Sept 2016
  4. ^ Nair P, Wenzel S, Rabe KF, Bourdin A, Lugogo NL, Kuna P, et al. (June 2017). "Oral Glucocorticoid-Sparing Effect of Benralizumab in Severe Asthma". The New England Journal of Medicine. 376 (25): 2448–2458. doi:10.1056/NEJMoa1703501. PMID 28530840.
  5. ^ "Fasenra (benralizumab) receives US FDA approval for severe eosinophilic asthma". AstraZeneca. 2017-11-14.
  6. ^ "Fasenra granted US Orphan Drug Designation for eosinophilic oesophagitis". Retrieved 2019-10-29.