Dupilumab injection is used to treat the symptoms of eczema (atopic dermatitis; a skin disease that causes the skin to be dry and itchy and to sometimes develop red, scaly rashes) in adults and children 6 months of age and older who cannot use other medications for their condition or whose eczema has not responded to other medications. It is also used along with other medications to prevent wheezing, shortness of breath, coughing, and chest tightness due to certain types of asthma in adults and children 6 years and older whose symptoms are not controlled with other medications. Dupilumab injection is also used along with other medications to treat chronic rhinosinusitis with nasal polyposis (ongoing runny nose, sinus swelling and/or nasal congestion, with or without a reduced sense of smell or pain and pressure in the face) in adults whose symptoms are not controlled with other medications. It is also used to treat eosinophilic esophagitis (EoE; a condition that involves high levels of blood cells in the esophagus [tube that connects the mouth to the stomach] that may damage tissues of the esophagus) in adults and children 12 years of age and older who weigh at least 88 pounds (40 kg). Dupilumab injection is in a class of medications called monoclonal antibodies. It works by stopping the action of certain substances in the body that cause inflammation.