Vancomycin Injection Pharmacy Bulk Glass Vial 5 Gram by Pfizer (RX)Vancomycin Hydrochloride Injection is an antibiotic used to treat severe bacterial infections, especially those caused by methicillin resistant Staphylococcus aureus (MRSA) and other Gram positive bacteria. It is commonly administered to manage serious infections such as sepsis, endocarditis, and skin infections when other antibiotics are ineffective. The injection helps inhibit bacterial cell wall synthesis, ultimately killing the bacteria.