Vancomycin is a very strong antibiotic drug, mainly indicated for systemic infections caused by methicillin-resistant Staphylococcus aureus, intestinal infections caused by Clostridium difficile, and systemic infections. Patients with penicillin allergy cannot use penicillins or cephalosporins, or patients with severe staphylococcal infections that have not been treated with the above antibiotics can use vancomycin. Therefore, vancomycin is the last choice when other drugs are resistant or not effective. Vancomycin should not be abused, and once it is abused, it will become resistant when you really want to use it, and there will be no antibiotics available at this time. The general usage is 0.8-1.6g per day in 2-3 doses of IV. The main adverse effects are rash, nausea, phlebitis and other symptoms.