Vancomycin HCl is a medication used to treat serious bacterial infections. It belongs to the class of antibiotics known as glycopeptides and works by inhibiting the growth and spread of bacteria. Vancomycin HCl is commonly used to treat infections caused by methicillin-resistant Staphylococcus aureus (MRSA) and other drug-resistant bacteria. It is typically administered intravenously and is reserved for severe infections when other antibiotics have failed or are not suitable.