Rocephin is the brand name of a popular antibiotic called ceftriaxone. However, there are several synonyms for this medication that may be used interchangeably. Some of the most common synonyms for Rocephin include Ceftrax, Cefriaxone, Ceftriabol, and Cetriaxone. All of these medications belong to the cephalosporin class of antibiotics and are used to treat a variety of bacterial infections. While the brand name may vary, the active ingredient and effectiveness of the medication remain the same. Therefore, it is important to consult with a healthcare provider to determine the most appropriate antibiotic for any particular infection.