Postmarketing Analysis of Eosinophilic Adverse Reactions in the use of Biologic Therapies for Type 2 Inflammatory Conditions.

Eosinophilic adverse reactions are rare but consequential complications of biological treatment. They are more common among patients treated for asthma and chronic rhinosinusitis with nasal polyposis. Measuring and monitoring blood eosinophil levels may be appropriate in specific clinical instances when patients are started on different biologic therapies for type 2 inflammatory conditions.