Description Noromycin 300 LA is a sterile, ready to use solution of the broad-spectrum antibiotic oxytetracycline dihydrate. Oxytetracycline is an antimicrobial agent that is effective in treatment of a wide range of diseases caused by susceptible gram-positive and gram-negative bacteria.The antibiotic activity of oxytetracycline is not appreciably diminished in the presence of body fluids, serum or exudates.