Effective in vitro against the following bacterial species: Bordetella bronchiseptica, Corynebacterium pyogenes, Erysipelothrix rhusiopathiae, Escherichia coli, Haemophilus somnus, Pasteurella haemolytica, Pasteurella multocida, Salmonella dublin, Staphylococcus aureus, Streptococcus agalactiae, Streptococcus faecalis, Streptococcus pyogenes and Streptococcus uberis. Specifically formulated to provide a prolonged action resulting in sustained antibacterial activity. Blood levels persist for at least 4 days after IM administration. Maximum blood levels are achieved after 4-8 hrs, making it suitable for the treatment of acute infections.