Antibiotic
Interfere with bacterial cell wall synthesis
Cattle, sheep-shipping fever by Pasturella multocida
Swine- Erysipelas
Horse- strangles
Give 6000 IU per kg increase dose to 12,000 - 18,000 IU /kg for serious infection
Diarrhoea, methaemoglobenemia, anemia
Nausea, pain, vomiting