Pneumovax is a trademark name for the pneumococcal vaccine, which is used to protect against certain types of pneumonia. Synonyms for Pneumovax include pneumococcal polysaccharide vaccine (PPV23), pneumococcal vaccine, and the pneumonia vaccine. These vaccines work by stimulating the immune system to produce antibodies against the bacteria responsible for causing pneumonia. Some common brand names include Prevnar 13 and Synflorix, both of which protect against a smaller range of pneumonia-causing bacteria. It is important to always talk to a healthcare provider to determine which vaccine is appropriate for individual health needs. Regardless of the name, these vaccines serve an important purpose in protecting people from potentially deadly pneumonia.