Cetuximab, or cetuximab injection, works by inhibiting the proliferation of tumor cells, among other things, with side effects such as headache and conjunctivitis. It should be used in accordance with medical advice. Cetuximab injection can inhibit the proliferation of tumor cells, induce their apoptosis, and reduce the generation of tumor neovascularization. It can be combined with irinotecan for the treatment of metastatic colorectal cancer. Adverse reactions to cetuximab injection include headache, conjunctivitis, diarrhea, nausea, vomiting, hypomagnesemia, dehydration, hypocalcemia, loss of appetite, weight loss, elevated liver enzyme levels, sores-like rashes, itching, double infections, and infusion reactions. The drug is contraindicated in people with severe hypersensitivity reactions to cetuximab. Patients should regulate the use of the drug under the guidance of a doctor, do not use it without authorization.