CEFTRIAXONE INJECTION I.P. 500MG is used to treat a variety of conditions such as urinary tract infections, infection of the ears, lungs and meningitis caused by bacteria. It should not be used with calcium-containing intravenous solutions. Ceftriaxone is used to treat a wide variety of bacterial infections. This medication belongs to a class of Products known as cephalosporin antibiotics. It works by stopping the growth of bacteria.