Monoclonal antibodies are used to treat many health conditions, including rheumatoid arthritis, asthma, several types of cancer, and more. These medications broadly work by targeting specific proteins or cells in your body to help your immune system fight diseases more effectively. Monoclonal antibodies come in different forms, including injections and infusions. Some examples include Dupixent (dupilumab), Kesimpta (ofatumumab), and Evenity (romosozumab).