Rocephin 500mg IM Injection – Ceftriaxone Antibiotic for Moderate to Severe InfectionsRocephin 500mg IM Injection Rocephin 500mg IM Injection contains Ceftriaxone, a third generation cephalosporin antibiotic used for the treatment of moderate to severe bacterial infections. It is administered intramuscularly (IM) by a trained healthcare professional. Doctors prescribe Rocephin 500mg IM for Respiratory infections such as pneumonia and bronchitis, Urinary tract infections (UTIs), Gonorrhea and other sexually transmitted infections