Cefetamet Products | Cleanchem - Cefetamet is a third-generation cephalosporin antibiotic used to treat respiratory, skin, and urinary tract infections. It works by inhibiting bacterial cell wall synthesis, effectively killing bacteria. Cefetamet is effective against a variety of gram-negative and gram-positive pathogens. Side effects can include nausea, diarrhea, and allergic reactions such as rash and fever.