A broad spectrum antibactirial used for treatment of certain Mycoplasma species, spirochetes, serpulina hyodisenteriae. And active against positive Gram bacteria: staphylococcus, streptococcus, erysipelotrix rhusiopathiae, corynebacterium pyogenes, clostridium, and negative Gram bacteria: fusobacterium necrophorum, pasteurella, bordetella brochiseptica