Learn more about DUPIXENT® (dupilumab), a prescription biologic subcutaneous injection used to treat people 2+ years old with chronic spontaneous urticaria (CSU), also known as chronic hives with no known cause, who continue to have hives that are not controlled with H1 antihistamine treatment. DUPIXENT is not used to treat any other forms of hives (urticaria). Serious side effects can occur. Please see important safety information and prescribing information and patient information on the webs