During the pandemic, healthcare professionals have been using immune-modifying drugs called interleukin-6 (IL-6) receptor inhibitors “off label” in an attempt to prevent this from happening. Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.These drugs, which are monoclonal antibodies, work by targeting receptors for an immune signaling molecule, or cytokine, called IL-6.