I tried Fasenra which contains a monoclonal antibody directed against the alpha chain of the interleukin 5 (IL5) receptor. My eosinophil count dropped to zero!
After three years I decided the cost- benefit analysis didn't justify continuing this medication. I am sure there will be many meds directed against the action of these interleukins. The primary literature has shown already that some are more efficacious than others. All are expensive, even if insurance pays some of the cost.