Vancomycin is an antibacterial drug, which is a glycopeptide antibacterial drug and also belongs to the special use class of antibacterial drugs in hospitals, which has a particularly powerful bactericidal effect on gram-positive cocci. Clinically, it is mainly used to treat serious infections caused by drug-resistant staphylococci, and also for patients who cannot use other antibiotics, such as patients with penicillin allergy, cephalosporin allergy or patients with staphylococcal, enterococcal, or gram-positive coccus infections where other antibiotics are ineffective, and can only be administered intravenously; oral administration is not absorbed. However, treatment of pseudomembranous colitis or staphylococcal enteritis caused by Clostridium difficile can be administered orally in intravenous form. The main side effects include ototoxicity, nephrotoxicity, allergic reactions and digestive system reactions, etc. Generally, slow titration is required for its use, otherwise it will lead to red man syndrome.