List of the 2 NDC products with the active ingredient Cetuximab. Cetuximab is used to treat a certain type of cancer of the colon (large intestine) or rectum. This medication is also used to treat head and neck cancer. Cetuximab works by slowing or stopping the growth of cancer cells. It binds to a certain protein (epidermal growth factor receptor-EGFR) in some tumors. Cetuximab is a man-made protein (monoclonal antibody).