Cetuximab and panitumumab, both anti-epidermal growth factor receptor (EGFR) monoclonal antibodies (MAb), have demonstrated clinical activity in patients with colorectal cancer. They are well tolerated, but they involve various adverse events that are rare among cytotoxic agents. Typical adverse events associated with anti-EGFR MAbs include infusion reaction, skin toxicity, lung toxicity, and hypomagnesemia. It is necessary to recognize and manage adverse events promptly to continue treatments without drug discontinuation. This report details the adverse events and their management with anti-EGFR MAbs use.